His work explores ways technology can be used to improve HIV/STI prevention and care. He serves as PI of NIH-funded research to use sensors, smartphones, and web-based tools to (1) improve the HIV testing experience, both in the clinic and when patients test at home, (2) understand and change HIV risk behavior, and (3) identify when HIV patients are at risk for lapsing in care and facilitate interventions to retain them. He also leads a pilot study funded by the Brown/Tufts/Lifespan Center for AIDS Research exploring adherence to pre-exposure prophylaxis in patients at especially high-risk for HIV.