Founder and headmaster of the innovative DeSisto School in Stockbridge, Mass., which specializes in helping troubled adolescents through unusual programs that include the culinary and performing arts. Mr. DeSisto was a psychotherapist as well as an educator. For 11 years he was director of the Lake Grove School on Long Island. Then, in 1978, with financing from students' parents, he went out on his own, founding the DeSisto School in the Berkshires. Officially described as a therapeutic boarding school, it combines a general academic college-preparatory program with individual, group and family psychotherapy. Many students enter the school straight from drug rehabilitation or brushes with the law. Born and reared in Boston, Mr. DeSisto attended St. John's Seminary there and received a bachelor's degree from Stonehill College in North Easton, Mass. He is survived by his wife, Margie Charles Bullock, and by a sister, Jacqueline DeSisto of Stockbridge.