Perry N. Halkitis, PhD, is a health and educational psychologist and research methodologist, as well as an associate professor and chair of applied psychology at New York University and codirector of the Center for HIV/AIDS Educational Studies and Training. His research has focused on prevention for HIV-positive individuals, HIV treatment and adherence issues, and methamphetamine and other club-drug use in the gay community, among other issues. He was the recipient of the 999 American Psychological Foundation Placek Award, the New York University 999 Daniel E. Griffith's Research Award, the 2 2 APA Emerging Leader award, and the 2 2 APA Award for Distinguished Contribution to Research in the lesbian gay bisexual transgender community. He received his doctorate in educational psychology from the City University of New York.
 
Cynthia A. Gomez, PhD, is an associate professor in the Department of Medicine and codirector of the Center for AIDS Prevention Studies at the University of California, San Francisco. Her scientific work has focused on the development of HIV prevention interventions for diverse populations as well as on the influence of social factors such as race, ethnicity, gender, and class on sexual behaviors. She has served on several national committees, including the Centers for Disease Control and Prevention's HIV and STD Advisory Council and the APA Committee on Psychology and AIDS. She served on the Presidential Advisory Council on HIV/AIDS under the Clinton and latter Bush administrations. She received her doctorate in clinical psychology from Boston University.
 
Richard J. Wolitski, PhD, serves as chief of the Community Intervention Research Section, Prevention Research Branch, Division of HIV and AIDS Prevention, National Center for HIV, STD, and TB Prevention, at the Centers for Disease Control and Prevention. His research is devoted to furthering an ecological understanding of HIV risk in vulnerable populations and applying this knowledge to developing effective and sustainable interventions that limit the further spread of HIV. Following his own diagnosis with HIV in 994, his work began to focus on psychological and interpersonal factors that affect HIV-positive individuals' risk of acquiring or transmitting sexually transmitted infections. This experience motivated him to author the program announcement under which the Seropositive Urban Men's Study was funded in 99 . He received his doctorate in community psychology from Georgia State University.