I have been PI or protocol chair of 16 federally funded studies (via NIMH, NIDA, and NIAID), and, in addition to studies where I am PI, I have regularly served as co-PI, co-investigator, or mentor on studies related to HIV prevention and treatment. Much of my work on HIV focuses on prevention and treatment with gay, bisexual, and other men who have sex with men (MSM), though I have worked extensively with other populations including individuals with depression and those who have struggled with substance use disorders. Finally, during my time at MGH, I worked on studies of cognitive-behavioral therapy for ADHD in adulthood and adolescence. With respect to my HIV work, I collaborate extensively with other investigators both in the Psychology Department, as well as the University of Miami Miller School of Medicine, and the School of Nursing and Health Sciences, and am Co-Director of the Behavioral/Social Sciences and Community Outreach Core for the UM Center for AIDS Research (CFAR).