David Marcus began the practice of music therapy in 1984 after several years as a professional musician. For the next 15 years he worked with psychiatric patients at units of the New York State Office of Mental Health: Manhattan Psychiatric Center and Bronx Psychiatric Center. He supervised fieldwork students and interns at these facilities. He has presented on music therapy in psychiatric treatment in these and other psychiatric facilities around the state. He has practiced music therapy at the Nordoff-Robbins Center since receiving his certification in the Nordoff-Robbins approach in 1997. He helped to found the Creative Music Therapy Studio, a private music therapy practice in Manhattan, where he continues to serve as Co-director.
David served as Editor-in-Chief of Music Therapy, the scholarly journal of the American Association for Music Therapy, for five years. He is also the author of the chapter "Entering the World of Tones, in Listening, Playing, Creating: Essays on the Power of Sound," edited by Carolyn Kenny and published by the State University of New York Press. He has recently assumed the title of Coordinator of Special Projects and Publishing at the Nordoff-Robbins Center. In addition to his clinical duties, he will be working with Center staff to prepare clinical and instructional materials for dissemination.