KEENE, N.H. - Dr. Louis Ormont, a professor of psychology and a pioneer in the field of group psychotherapy, has died. He was 90.

Ormont died Nov. 15 at Cheshire Medical Center in Keene, where he was recuperating following open heart surgery in July.

Ormont developed a practice of seeing people only in group treatment and went on to train hundreds of therapists.

In 1989, colleagues who had benefited from his work founded The Center for Group Studies in his honor, a freestanding educational institution in New York City dedicated to teaching group leadership skills to therapists and non-therapists alike.

Ormont authored over 30 articles and several books, including "The Group Therapy Experience" in 1992.

In 1974, Ormont was appointed clinical professor of psychology at Adelphi University's Gordon Derner Institute of Advanced Psychological Studies. He is also a founder of The Center for Modern Psychoanalytic Studies in New York and has taught at the Philadelphia School of Psychoanalysis, and the Boston Graduate School for Psychoanalysis.