Gregg Henriques

Gregg Henriques, Ph.D.Gregg Henriques, Ph.D., Task Force Co-Chair (Level IV)

Dr. Gregg Henriques is associate professor of psychology at James Madison University and Director of JMU’s Combined-Integrated Doctoral Program in Clinical and School Psychology.

Dr. Henriques’ teaches unified psychotherapy, personality and personality assessment and psychopathology. His primary areas of interest are in the theoretical unification of psychology and the promotion of a unified psychotherapy.

Most importantly, he has developed a new scientific humanistic philosophy called the Tree of Knowledge System, which he argues can unite the key insights of the various paradigms into a more coherence whole.

Dr. Henriques has published his ideas in several prominent journals, and special issues of the Journal of Clinical Psychology and Theory and Psychology have been devoted to presenting and critiquing the system. He is currently involved on a book project, A New Unified Theory of Psychology, that spells out his vision in greater detail.

He received his BA in Psychology from JMU, his M.A. in Clinical/Community Psychology from the University of North Carolina-Charlotte, his Ph.D. from the University of Vermont and post-doctoral training at the University of Pennsylvania. He joined the faculty at JMU in 2003 and was appointed director in 2005.


Henriques, G. R. (2008). Unification and the Tree of Knowledge System: Extensions and Critiques. Special section of Theory and Psychology (18).

Henriques, G. (2008). The problem of psychology and the integration of human knowledge: Contrasting Wilson’s Consilience with the Tree of Knowledge System. Theory and Psychology, 18, 731-755.

Quackenbush, S., & Henriques, G. R. (2008). Clinical psychology and politics. Chapter in Handbook of Clinical Psychology.

Henriques, G. R. (2007). Integrating treatments into an effective package. Pragmatic Case Studies in Psychotherapy, 3, 50-60.

Henriques, G. R. (2005). Toward a useful mass movement. Journal of Clinical Psychology, 61,121-139.

Henriques, G. R. (2004). The development of the unified theory and the future of psychotherapy. Psychotherapy Bulletin, 39, 16-21.

Henriques, G. R. (2004). Psychology defined. Journal of Clinical Psychology, 60, 1207-1221.

Henriques, G. R., & Sternberg, R. J. (2004). Unified professional psychology: Implications for combined-integrated doctoral training programs. Journal of Clinical Psychology, 60, 1051-1063.

Henriques, G. R. (2003). The tree of knowledge system and the theoretical unification of psychology. Review of General Psychology, 7, 150-182.

Henriques, G. R. (2002). The harmful dysfunction analysis and the differentiation between mental disorder and disease. Scientific Review of Mental Health Practice, 1(2), 157-173.