Dr. David Walker has worked as a psychotherapist and cultural psychologist for over 20 years, specializing in the field of complex trauma recovery. After completing his Ph.D. in clinical psychology at the University of Detroit in 1992, he served as a training supervisor in group psychotherapy and neuropsychology at the Detroit Psychiatric Institute. He also worked for several years as an international consultant, cultural specialist, and coach with Personnel Decisions International.

Dr. Walker is currently an associate professor and a core faculty member for the Clinical Psychology Program in the American School of Professional Psychology at Argosy University in Seattle. He is also a primary clinical supervisor overseeing graduate student training in assessment and psychotherapy at the Argosy University Seattle Psychology Center. He is a 'Level 1' practitioner of Accelerated Experiential Dynamic Psychotherapy (AEDP).

A licensed psychologist in the state of Washington, Dr. Walker worked for the Indian Health Service from 2000 to 2004. He continues to maintain friendships with and serves as a contract consultant to the 14 Confederated Tribes and Bands of the Yakama Nation. He also consults with Skagit County Human Services and Phoenix Recovery Services in Mt. Vernon, Washington.

Dr. Walker was keynote speaker at the Pathways to Hope & Healing Conference at the Yakama Legends Casino (2002, 2003) and the "Then I Came Back" Juvenile Justice Conference of the Confederated Tribes of the Colville Nation in Nespelum in 2004. His selected publications include papers in the International Journal of Critical Psychology (2003) and a chapter for Critical New Perspectives on ADHD, winner of the United Kingdom's National Association for Special Educational Needs (NASEN) Academic Book Award (2006). He is currently working on a book on the history of mental health practices in relation to Native American cultural oppression.

Dr. Walker has served on past faculties of Oakland University and Wayne State University Medical School. He is a member of the Society of Indian Psychologists, the American Psychological Association, and the Advisory Council of the International Center for the Study of Psychiatry and Psychology.