2027 Different Types of Industrial Organizational Psychology Doctorate Degrees: PhD, DBA, EdD, DNP, PsyD, and Professional Doctorate Paths
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Choosing an industrial organizational psychology doctorate is really a career-design decision: do you want to produce research, lead organizations, teach, consult, practice psychology, or improve healthcare workplaces? The stakes are high because doctoral study is long, specialized, and costly. The U. S. Bureau of Labor Statistics reported a median annual wage of $94,310 for psychologists in May 2024, but doctorate outcomes vary widely by role, license, employer, and specialization. This guide helps you compare PhD, DBA, EdD, DNP, PsyD, and professional doctorate paths so you can match the degree to your actual goal.
Key Things You Should Know
- A PhD is usually the best fit for I-O psychology research, university faculty work, psychometrics, test validation, and evidence-building roles; professional doctorates such as DBA and EdD are typically better aligned with executive, consulting, organizational learning, or applied leadership work.
- DBA, EdD, DNP, and PsyD degrees are not interchangeable: a DBA centers on business problems, an EdD on education and learning systems, a DNP on advanced nursing and healthcare practice, and a PsyD on professional psychology practice, often with licensure implications outside traditional I-O psychology.
- Cost and time should be evaluated against the role you want; NCES graduate education data show that tuition varies substantially by institution type, and BLS May 2024 wage data show different labor markets for psychologists, HR leaders, management analysts, healthcare managers, and faculty roles.
What Are the Different Types of Industrial Organizational Psychology Doctorate Degrees?
Industrial organizational psychology applies psychological science to work. Doctoral options differ because "I-O psychology" can lead to several destinations: academic research, organizational consulting, people analytics, human resources leadership, executive development, workforce health, or psychology practice. The degree title signals how much the program emphasizes theory, research methods, clinical preparation, or applied problem-solving.
The table below compares common doctorate paths that may overlap with industrial organizational psychology careers. Use it to identify the degree family that best matches your intended work setting before comparing individual programs.
| Doctorate type | Primary focus | Typical I-O psychology connection | Best fit for | Usually not ideal for |
| PhD in Industrial Organizational Psychology | Original research, theory, statistics, measurement, and scholarly contribution | Direct preparation for I-O research, faculty roles, assessment, selection, workforce analytics, and consulting | Students who want rigorous research training or academic credibility in I-O psychology | Students who want the fastest route to executive practice without a research dissertation |
| DBA with organizational behavior, leadership, or HR focus | Applied business research and executive decision-making | Uses I-O concepts to solve organizational problems such as retention, leadership, culture, or performance | Senior managers, consultants, HR executives, and business leaders | Students seeking a traditional psychology faculty pipeline or psychology licensure |
| EdD in organizational leadership, learning, or human development | Educational leadership, learning systems, training, and institutional change | Relevant to workplace learning, leadership development, coaching, talent development, and organizational change | Training leaders, higher education professionals, OD practitioners, and learning executives | Students whose main goal is psychometric research in I-O psychology |
| DNP with healthcare leadership or systems focus | Advanced nursing practice, clinical leadership, quality improvement, and healthcare systems | Relevant only when I-O psychology interests are tied to nursing workforce, burnout, patient safety culture, or healthcare operations | Licensed nurses pursuing advanced practice or healthcare leadership | Non-nurses or students seeking a general I-O psychology doctorate |
| PsyD in psychology | Professional psychology practice, assessment, intervention, and supervised training | May connect to consulting, assessment, leadership coaching, or occupational health, depending on program design | Students seeking practice-oriented psychology training, often with licensure-oriented coursework | Students focused only on organizational research or business leadership |
| Other professional doctorates | Applied leadership, public administration, public health, social work, or organizational practice | Can support specialized work in workforce policy, public-sector leadership, health systems, or organizational change | Professionals with a defined sector-specific goal | Students who need a degree specifically recognized as I-O psychology |
If you are not ready for a doctorate, a master's degree can be a strategic bridge into HR, organizational development, or analytics roles before committing to doctoral study. For example, prospective students comparing leadership-oriented pathways may want to review best organizational development master's programs online before deciding whether a doctorate is necessary.
The most important distinction is not the title alone; it is the degree's evidence model. A PhD asks, "What new knowledge can I contribute?" A professional doctorate usually asks, "What complex problem can I solve using advanced evidence?" That difference affects coursework, faculty fit, dissertation expectations, time commitment, funding, and career signaling.
What Is the Difference Between a PhD and a Professional Doctorate in Industrial Organizational Psychology?
A PhD in industrial organizational psychology is a research doctorate. It is designed to train scholars who can design studies, analyze data, publish findings, teach, and build or evaluate psychological theories about work. A professional doctorate is usually practice-focused. It trains advanced practitioners to apply research to organizational, educational, clinical, business, or healthcare problems.
The practical difference matters because employers and universities may read these degrees differently. A research university hiring a tenure-track I-O psychology professor will often prefer a PhD with publications, quantitative methods training, and a dissertation in the field. A company hiring a chief learning officer, HR analytics leader, or organizational transformation consultant may care more about applied project experience, executive credibility, and measurable workplace outcomes.
The table below summarizes the key academic and career differences. It is especially useful if you are choosing between a traditional I-O psychology PhD and a professional doctorate with an organizational focus.
| Comparison point | PhD in I-O psychology | Professional doctorate |
| Core purpose | Create original scholarly knowledge | Apply research to professional problems |
| Typical final project | Dissertation based on original research | Applied dissertation, capstone, consulting project, quality improvement project, or practice-based study |
| Research depth | Usually extensive, including advanced statistics, research design, measurement, and theory | Varies by degree; usually applied and problem-centered rather than theory-building |
| Faculty career alignment | Strongest alignment for research-intensive academic roles | May fit teaching, practitioner-scholar, or leadership roles, depending on institution |
| Professional leadership alignment | Strong when paired with consulting, analytics, or assessment experience | Often strong for executives, administrators, consultants, and practice leaders |
| Licensure relevance | Not automatic; I-O psychology licensure rules vary and many I-O roles are nonclinical | Depends heavily on degree type; PsyD and DNP may carry specific licensure or practice implications |
One current trend influencing this choice is the rise of AI-enabled people analytics. Organizations increasingly use algorithms for hiring, performance management, engagement analysis, and workforce planning. A PhD may provide deeper preparation to validate assessments and evaluate bias, while a DBA or EdD may better fit leaders implementing ethical analytics systems across a company or institution.
A common mistake is assuming a professional doctorate is an "easier PhD." It is better to think of it as a different doctoral model. The rigor should still be doctoral, but the output, audience, and professional signal are different.
What Is a PhD in Industrial Organizational Psychology and Who Should Pursue One?
A PhD in industrial organizational psychology is the most direct doctorate for students who want advanced expertise in workplace psychology as a scientific discipline. Coursework commonly includes personnel selection, organizational behavior, motivation, leadership, work attitudes, job analysis, psychometrics, research methods, statistics, and legal or ethical issues in assessment.
This path makes the most sense if your future work depends on research credibility. That includes academic faculty roles, applied research jobs, test development, organizational assessment, people analytics, and high-level consulting where clients expect scientific depth. The BLS reported that the median annual wage for psychologists was $94,310 in May 2024; however, I-O compensation can differ from the broader psychologist category because many roles sit in business, consulting, government, or HR analytics rather than healthcare practice.
Students should consider a PhD in I-O psychology when these goals describe them:
- You want to conduct original research on work behavior, employee selection, leadership, motivation, teams, culture, or occupational well-being.
- You are interested in becoming a professor, research scientist, assessment developer, psychometrician, or evidence-based organizational consultant.
- You enjoy quantitative methods, data analysis, measurement, and theory more than purely administrative leadership.
- You want the strongest doctoral alignment with the field of industrial organizational psychology itself.
A PhD may be a poor fit if you mainly want a business leadership credential, do not want a dissertation, dislike advanced statistics, or need a part-time executive format with minimal research intensity. Some PhD programs are full-time and campus-based, and funded programs may expect teaching or research assistantship work.
Before applying, look closely at faculty research areas. In I-O psychology, fit with a faculty mentor can matter as much as the degree title. A program known for selection and assessment may not be ideal if your goal is occupational health, and a program centered on organizational behavior may not provide the psychometrics depth needed for assessment development.
A DBA can be a strong alternative for industrial organizational psychology professionals who want to solve business problems rather than become psychology researchers. DBA programs often attract mid-career and senior professionals in HR, consulting, operations, leadership development, organizational behavior, and strategy.
The key difference is the DBA's business lens. Instead of asking how a psychological theory advances the field, a DBA project may ask how an organization can reduce turnover, improve leader effectiveness, redesign talent systems, increase engagement, or manage change. The BLS reported a May 2024 median annual wage of $101,190 for management analysts, a labor category that overlaps with some consulting and organizational improvement work; this figure is not a DBA outcome guarantee, but it helps frame the market DBA graduates may target.
The table below shows when a DBA or PhD is usually the stronger fit for an I-O-oriented professional.
| Career goal | PhD fit | DBA fit |
| Tenure-track I-O psychology professor | Usually stronger | Usually weaker unless the school values practitioner scholarship |
| Chief human resources officer or people strategy executive | Useful but may be more research-heavy than needed | Often strong because of executive and business orientation |
| Organizational consulting practice | Strong for evidence-based consulting and assessment | Strong for business transformation, strategy, and executive clients |
| People analytics or psychometrics | Usually stronger for measurement and advanced research design | Useful if analytics are applied to business decision-making |
| Publishing scholarly I-O research | Usually stronger | Possible but not usually the central purpose |
A DBA is often most valuable when paired with prior professional experience. If you are earlier in your career, a specialized master's in HR or I-O-related fields may offer better near-term ROI before a doctorate. Students exploring that route can compare best online masters degree in human resource management programs to build a foundation before deciding whether a DBA is necessary.
The main red flag is choosing a DBA because it sounds more "executive" without checking dissertation expectations, faculty expertise, accreditation, and employer recognition. A strong DBA should still require rigorous applied research, not just leadership reflection.
An EdD can be the right doctorate path when your I-O psychology interests center on learning, leadership development, training systems, institutional change, coaching, or organizational development. It is especially relevant for professionals in higher education, corporate learning, K-12 administration, nonprofit leadership, government training, and workforce development.
The EdD differs from the PhD because its goal is usually improvement in practice. An EdD student might study how to improve manager training, reduce employee resistance during organizational change, redesign leadership development programs, or evaluate learning outcomes in a workplace academy. For people working in talent development, the EdD's focus on adult learning and systems change can be more practical than a psychology PhD.
Consider an EdD if your professional questions look like these:
- How can an organization design leadership programs that actually change manager behavior?
- How can training improve transfer of learning from the classroom to the job?
- How can universities, nonprofits, or companies build healthier organizational cultures?
- How can employee learning data be used ethically to improve performance and retention?
The U.S. labor market has continued to reward advanced leadership roles, but salaries depend on industry and position. BLS May 2024 data placed the median annual wage for training and development managers at $125,040, which shows why some learning leaders consider doctoral study; it does not mean an EdD is required for every training leadership role.
Cost-sensitive students should also compare whether a master's degree can accomplish the same goal. For example, professionals who need HR credentials before doctoral study may want to review cheapest online master's in human resources options before committing to a longer EdD program.
A common mistake is assuming an EdD in leadership is the same as an I-O psychology doctorate. It is not. It can be highly relevant, but it may not provide the same depth in psychometrics, selection, statistical modeling, or psychological theory.
A DNP makes sense for an industrial organizational psychology-related path only in a specific situation: you are a nurse or advanced nursing professional who wants to apply organizational psychology concepts to healthcare systems, nursing workforce outcomes, patient safety culture, burnout prevention, staffing models, quality improvement, or clinical leadership.
The DNP is not a general I-O psychology doctorate. It is a practice doctorate in nursing. Its value comes from combining clinical authority with systems-level leadership. A DNP student might lead a project to reduce nurse burnout, improve handoff communication, strengthen safety culture, or redesign team processes in a hospital or clinic.
The table below clarifies where the DNP does and does not overlap with industrial organizational psychology.
| Question | DNP answer | Why it matters |
| Is it an I-O psychology doctorate? | No | It is a nursing practice doctorate, even when it studies workplace behavior in healthcare. |
| Can it support organizational psychology work? | Yes, within healthcare systems | Projects may address teamwork, leadership, burnout, culture, and quality improvement. |
| Is it appropriate for non-nurses? | Generally no | DNP programs typically require nursing education and licensure. |
| Does it replace a PhD in I-O psychology? | No | It prepares advanced nursing practice and leadership, not I-O research specialization. |
BLS May 2024 data reported a median annual wage of $117,960 for medical and health services managers, a category relevant to some healthcare leadership paths. For nurses considering a DNP, this helps frame the healthcare management labor market, but the degree's value depends on licensure, role, employer expectations, and clinical background.
Choose a DNP only if nursing is central to your professional identity. If your real goal is organizational consulting across industries, a PhD, DBA, EdD, or organizational leadership doctorate is usually a better match.
A PsyD is a professional doctorate in psychology that emphasizes practice more than traditional research. In many programs, the PsyD is designed for students pursuing clinical, counseling, or school psychology practice, often with supervised training and licensure-oriented preparation. That makes it different from a PhD in industrial organizational psychology, which usually focuses on research, measurement, and workplace behavior rather than therapy or clinical treatment.
The PsyD can overlap with I-O psychology when students are interested in assessment, executive coaching, occupational health, police and public safety psychology, employee well-being, or consulting. However, the fit depends heavily on the program's curriculum. A general clinical PsyD may not provide deep preparation in job analysis, selection validation, compensation psychology, or organizational research.
The table below compares the PsyD and PhD from the standpoint of an I-O psychology student.
| Factor | PhD in I-O psychology | PsyD |
| Main training model | Scientist or scientist-practitioner | Practitioner-scholar |
| Typical focus | Workplace behavior, selection, organizations, research methods, and analytics | Assessment, intervention, supervised practice, and applied psychology services |
| Licensure relevance | Varies; many I-O roles do not require clinical licensure | Often designed with psychology licensure pathways in mind, depending on accreditation and state rules |
| Best I-O-related use | Research, consulting, people analytics, assessment, and academic roles | Executive coaching, assessment practice, occupational health, or specialized applied psychology work |
| Risk for I-O students | May be too research-intensive for students who want practice only | May not provide enough I-O-specific research, HR, or organizational systems training |
Students interested in psychology practice should also understand that related master's fields do not automatically lead to the same outcomes as doctoral psychology training. For example, forensic psychology master's programs may support specialized knowledge in legal and behavioral settings, but they are distinct from PsyD, PhD, and I-O psychology doctorate pathways.
The most important red flag is assuming that any PsyD will qualify you for the I-O work you want. If your goal is licensure, verify accreditation and state board requirements. If your goal is organizational consulting, verify that the program offers coursework, practica, or faculty expertise in workplace assessment, leadership, and organizational systems.
Beyond PhD, DBA, EdD, DNP, and PsyD programs, several professional doctorates can support adjacent industrial organizational psychology careers. These degrees are usually best for students with a clearly defined sector, such as public administration, public health, social work, law, technology, or organizational leadership.
The table below outlines other doctorate options that may make sense when your work intersects with I-O psychology but is not centered on becoming an I-O psychologist.
| Doctorate | Best use case | I-O psychology connection | Important caution |
| Doctor of Public Administration | Government, nonprofit, public-sector leadership, labor policy, and workforce reform | Useful for employee engagement, leadership, culture, and organizational performance in public agencies | Not a psychology doctorate |
| Doctor of Public Health | Population health, workplace health, occupational well-being, and health systems leadership | Relevant to burnout, stress, safety climate, and organizational health interventions | May focus more on epidemiology and public health systems than organizational psychology |
| Doctor of Social Work | Human services leadership, workforce well-being, trauma-informed organizations, and program evaluation | Useful for organizational change in social service and behavioral health agencies | Does not replace I-O psychology or clinical psychology licensure requirements |
| Doctor of Strategic Leadership or Organizational Leadership | Executive leadership, change management, coaching, and organizational transformation | Often overlaps with motivation, leadership, culture, and team performance | Quality and recognition vary widely by institution |
| Doctor of Information Technology or analytics-focused doctorate | Workforce analytics, AI governance, HR technology, and decision systems | Relevant to people analytics, algorithmic hiring, and workforce data ethics | May lack psychological theory and assessment training |
These alternative doctorates can be practical when they match the environment where you want to work. For example, a public health doctorate may be better than a PhD in I-O psychology for someone studying burnout prevention across hospital systems, while a public administration doctorate may fit a civil service workforce leader better than a DBA.
The main mistake is using the word "organizational" as the only selection criterion. Many programs use similar language but train students for very different professional communities. Compare faculty expertise, final project expectations, alumni roles, accreditation, and whether the degree is recognized by the employers or boards that matter to you.
Doctoral timelines vary by degree type, enrollment status, dissertation or capstone scope, transfer credits, and whether clinical or supervised practice requirements apply. Full-time PhD programs in psychology often take longer because students complete advanced research training, assistantships, comprehensive exams, and a dissertation. Professional doctorates may be structured for working adults, but "shorter" does not always mean easier or cheaper.
The table below gives a practical planning view of common requirements. Individual programs can differ substantially, so use this as a comparison framework rather than a universal rule.
| Degree type | Typical time pattern | Common admissions expectations | Final requirement | Cost factors to compare |
| PhD in I-O psychology | Often about 4 to 6+ years, especially full-time | Bachelor's or master's preparation, strong GPA, statistics or research background, faculty fit, writing sample, recommendations | Original research dissertation | Funding availability, assistantship stipend, tuition remission, relocation, research costs, lost income |
| DBA | Often about 3 to 5 years, frequently part-time or executive format | Master's degree, professional experience, leadership background, applied problem interest | Applied dissertation or doctoral business project | Per-credit tuition, residency fees, travel, executive-format premiums, employer tuition support |
| EdD | Often about 3 to 5 years, commonly designed for working professionals | Master's degree, leadership or education-related experience, statement of problem of practice | Dissertation in practice, capstone, or applied research project | Online fees, cohort pricing, dissertation extension credits, transfer credit policy |
| DNP | Varies by entry point; post-master's routes are usually shorter than BSN-to-DNP routes | Nursing degree, active RN license, clinical background, sometimes APRN certification | DNP project, practicum hours, quality improvement or systems project | Clinical fees, practicum placement support, certification preparation, reduced work hours |
| PsyD | Often about 4 to 6+ years when internship and supervised practice are included | Psychology prerequisites, clinical or helping experience, interviews, recommendations, fit with practice model | Dissertation or doctoral project plus supervised training | Tuition, practicum expenses, internship relocation, licensure preparation, postdoctoral supervision |
Cost should be evaluated as total cost of completion, not just tuition. NCES graduate education data released in 2024 continue to show that graduate tuition differs sharply by institution control and program type, which means two doctorates with similar names can produce very different debt exposure. Also compare fees, health insurance, residency travel, dissertation continuation credits, technology fees, books, unpaid internship requirements, and the income you may give up while studying.
Use these steps before applying so you do not choose a program based only on branding or convenience:
- Define the job title or work setting you want after graduation, such as faculty member, HR executive, assessment consultant, licensed psychologist, healthcare leader, or organizational development director.
- Check whether that role requires a specific degree, accreditation, licensure path, internship, supervised hours, or state board approval.
- Compare curriculum depth in statistics, research methods, organizational theory, assessment, leadership, ethics, and applied project design.
- Ask programs for recent completion patterns, dissertation or capstone expectations, funding availability, assistantship requirements, and total cost estimates.
- Review faculty expertise and alumni roles to confirm that the program has already helped students move toward the outcome you want.
Online and hybrid formats can be excellent for working professionals, but they require extra due diligence. Confirm residency requirements, internship or practicum placement rules, whether online students receive the same advising and research support, and whether the program's accreditation meets your career or licensing needs.
Which Industrial Organizational Psychology Doctorate Is Best for Your Career Goals: PhD, DBA, EdD, DNP, PsyD, or Another Professional Doctorate?
The best industrial organizational psychology doctorate is the one that matches your end goal, not the one that sounds most prestigious. A PhD is usually the strongest choice for I-O research, faculty roles, psychometrics, and scientific consulting. A DBA fits business leaders and consultants who want to solve organizational problems. An EdD fits learning, leadership development, and institutional change. A DNP fits nurses applying organizational psychology concepts to healthcare systems. A PsyD fits psychology practice paths when assessment, intervention, and possible licensure are central.
The table below provides a direct decision guide. Start with your intended career outcome and then evaluate whether the doctorate's structure supports that outcome.
| If your goal is... | Usually consider... | Why | Verify before enrolling |
| Research professor in I-O psychology | PhD in I-O psychology | Best alignment with scholarly research, publications, and faculty hiring expectations | Faculty research fit, funding, placement record, research methods depth |
| Evidence-based organizational consultant | PhD, DBA, or EdD | Choice depends on whether your consulting is research-heavy, business-focused, or learning-centered | Client-relevant projects, methods training, alumni consulting roles |
| HR executive or people strategy leader | DBA, EdD, or PhD | DBA supports business strategy, EdD supports talent development, PhD supports analytics and assessment | Employer recognition, applied project relevance, leadership coursework |
| People analytics or assessment development | PhD in I-O psychology | Strongest preparation in psychometrics, validation, statistics, and research design | Quantitative curriculum, software training, assessment faculty, internship options |
| Healthcare workforce leadership as a nurse | DNP | Designed for advanced nursing practice and healthcare systems improvement | RN/APRN requirements, clinical hours, state rules, practicum support |
| Licensed psychology practice with organizational applications | PsyD or licensure-aligned PhD | Better fit when supervised practice and psychology licensure are central | APA accreditation where relevant, internship match, state board requirements |
Several common mistakes can lead to a costly mismatch. Watch for these red flags before committing to any doctorate:
- Choosing a doctorate based on title alone instead of matching the degree to a specific career outcome.
- Assuming every doctorate with "organizational leadership" in the name provides I-O psychology training.
- Ignoring accreditation, licensure, internship, or supervised practice requirements when pursuing psychology or nursing practice roles.
- Comparing tuition only and overlooking fees, travel, dissertation continuation credits, unpaid training, and lost income.
- Enrolling in an online doctorate without confirming research support, faculty access, residency requirements, and employer recognition.
- Assuming a DBA, EdD, DNP, PsyD, or other professional doctorate will be viewed the same as a PhD for research faculty roles.
A practical way to decide is to write one sentence: "I need a doctorate because I want to do ______ in ______ setting." If the blank says "publish research and teach I-O psychology," start with PhD programs. If it says "lead people strategy in a corporation," compare DBA, EdD, and selected PhD options. If it says "improve nursing workforce systems," look at DNP programs. If it says "practice psychology," focus on licensure-aligned PsyD or PhD programs.
The right doctorate should make your next professional step more credible, not just add letters after your name. Choose the program whose curriculum, faculty, final project, accreditation, and alumni outcomes match the work you actually want to perform.
Other Things You Should Know About Industrial Organizational Psychology
Not necessarily. Job titles, licensure rules, and employer expectations vary by state and setting. A PhD in I-O psychology is the clearest academic match, while DBA, EdD, DNP, PsyD, and other doctorates may support related roles without making the degree an I-O psychology doctorate.
APA accreditation is most relevant for health service psychology fields such as clinical, counseling, and school psychology. Many I-O psychology programs are not APA-accredited because I-O psychology is typically not a health service psychology licensure pathway. If licensure is your goal, check your state board before enrolling.
Many employers respect professional doctorates when the degree comes from an accredited institution and aligns with the role. Recognition is strongest when the program's applied project, faculty expertise, and alumni outcomes fit the employer's needs. For research faculty roles, a PhD may still be preferred.
It depends on the program and your background. Some PhD programs admit students after a bachelor's degree, while many professional doctorates expect a master's degree and work experience. A master's can also help you test your interest, strengthen research skills, and qualify for HR or organizational roles before committing to doctoral study.
- PhD vs PsyD | Which Degree Fits Your Career Goals? https://www.educationconnection.com/resources/phd-vs-psyd/
- How To Become An Industrial Organizational Psychologist | Psychology.org https://www.psychology.org/careers/industrial-organizational-psychologist/
- 11 Careers for I-O Ph.D. Grads - Organizational Psychology Degrees https://www.organizationalpsychologydegrees.com/lists/careers-for-i-o-ph-d-grads/
- Guide to I-O Psychology PhD Program Application - Paul Spector https://paulspector.com/guide-to-i-o-psychology-phd-program-application/
- Psychology Accreditation: What you need to know https://www.onlinepsychologydegrees.com/articles/accreditation/
- PsyD vs. PhD in Psychology https://onlinecounselingprograms.com/mental-health-careers/how-to-become-psychologist/psyd-vs-phd-in-psychology/
- Professional Doctorate SOP: How to Write for EdD, DBA, DNP, and PsyD Programs https://gradpilot.com/news/professional-doctorate-sop-edd-dba-dnp-psyd-guide
