Walt is an epidemiologist with the Los Angeles County Department of Public Health where he is in charge of the ethical and scientific review of all proposed research. He has done HIV research for more than 20 years in areas including use of alternative and complementary therapies by PLWHA, correlates of primary/acute HIV infection, service utilization and unmet needs by PLWHA, and prevention with positives. From 2000-2002, Walt directed CDC demonstration projects in prevention for positives as a visiting scientist. Walt adds his 45 years' experience as a social justice activist to his clinical and epidemiologic training and 20 years living with HIV in his service as Board Chair for CHAMP. One of his roles at CHAMP is to help assure that scientific and other evidence are available and understandable to PLWHA and other prevention justice advocates.