B.A. Psychology, State University of New York at Buffalo, 1949
M.A. Psychology, State University of New York at Buffalo, 1952
Ph.D. Psychology, State University of New York at Buffalo, 1955

Dr. Siegel's work in clinical psychology has developed along three major tracks: clinical work, consulting work, and academics. With respect to his clinical experience, Dr. Siegel was on the clinical faculty at the Menninger School of Psychiatry and also served as the Chief Psychologist at Topeka State Hospital from the mid-1950s through the mid-1960s.

He was the Director of Counseling Services and a member of the faculty at the University of California, Santa Cruz. Dr. Siegel has also maintained a private practice throughout the years, treating diverse populations presenting a variety of psychological issues. His theoretical focus is psychodynamic and group/organizational development.

He began consulting in the late 1950s, serving a wide range of entities such as the Teachers' Corps of the U.S. Office of Education, the Consumer Protection Division of the Ohio Department of Commerce, the National Institute of Mental Health, the American Psychological Association, and the Peace Corps. The services he provided as a consultant also varied tremendously. For example, as a selection officer for the Peace Corps, Dr. Siegel participated in evaluating the suitability of candidates for overseas assignment to South America and East Africa.

Dr. Siegel has extensive academic experience beginning at Ohio State University. During the ten years he was at Ohio State, Dr. Siegel was a Professor and Director of Clinical Training, and he created an innovative doctoral program in clinical psychology. He also served as Academic Dean at the Professional School of Psychology for several years and was a Faculty member of the Wright Institute from 1979-1998.