David Knopf is the Special Populations Coordinator for the National Adolescent Health Information Center, Assistant Clinical Professor of Pediatrics, and Clinical Social Worker with the Children’s Hospital at UCSF.  He is currently researching the development of health policy regarding special populations of adolescents and is reviewing adolescent mental health access and epidemiology issues. He is involved with several community-based projects including the Adolescent Health Working Group in San Francisco. He has been the author of guides for managed care organizations, chapters on adolescent maltreatment, adolescents in foster care, and public health and adolescents. In addition to his policy research activities, he does clinical work with adolescents in the Teen Clinic at UCSF, supervises social work fieldwork students, and teaches in the Leadership Education in Adolescent Health program of the Division of Adolescent Medicine. He earned the Master of Social Work degree at California State University, Sacramento, and the Master of Public Health degree at the University of North Carolina, Chapel Hill.