As a Ph.D. in clinical psychology and specialties in both adult and pediatric neuropsychology, as well as Post Traumatic Stress Disorder, he is known professionally as Dr. Marshall Colt.
After relocating from Denver first to the San Diego area in 1996, and later to Orange County, California, USA, where he continues in private practice in psychology.
Earned his doctorate, a Ph.D. in clinical psychology, concentrating in health psychology. Became accredited by the American Psychological Association (APA) from Fielding Graduate University in Santa Barbara, California.
In addition to his psychology private practice, he also founded Corporate Psychological Management, a consultancy company he founded upon his relocation to San Diego in 1996, and which he also later moved to Orange County, California.
Has been in private practice in psychology since 1994.