Dr. Colson has an overarching interest in the delivery of health and mental health services for disadvantaged populations, including behavioral and systemic issues which impact service use. He recently received NIH funding to conduct a study of HIV Pre-Exposure Prophylaxis among Black men having sex with men. He has served as a co-investigator in several RCTs of peer interventions to increase adherence among patients with HIV and with Latent Tuberculosis Infection. With funding from the Health Resources and Services Administration, Dr. Colson offered a 5-year training and technical assistance program for HIV peer educators and their supervisors. Earlier in his career, he studied TB, HIV, and service delivery issues experienced by homeless persons with mental illness. Dr. Colson has taught at Columbia University, Hunter College, the State University of New York at Stony Brook, and New York University.