 He is a former member of the APA Assembly, where he served as chair of the Assembly Committee of Representatives of Subspecialties and Sections and on the Assembly Executive Committee.In the APA he has also been past chair of the Committee on Psychotherapy by Psychiatrists, and the founding leader of the APA Psychotherapy Caucus.Plakun is a Fellow of the American College of Psychiatrists and a Fellow of the American College of Psychoanalysts.