He maintains a private practice specializing in psychotherapy and psycho-educational evaluations in both Teaneck, NJ, and in Jerusalem. Before moving to Israel, Dr. Yammer was the Director of Student Services at The Abraham Joshua Heschel School in New York City for 21 years. In addition, he was Senior Psychologist for the adolescent suicide project of the Adolescent Study Unit of the Psychiatric Institute of Columbia-Presbyterian Medical Center and was an Adjunct Assistant Professor in the doctoral programs in Professional Child and School Psychology at New York University.