He trained in internal medicine at University of California, San Francisco (UCSF) and was a Chief Resident at San Francisco General Hospital in 2003-2004. He does clinical and research-related work on the medical complications of substance use, specifically HIV and overdose. He provides primary care and office-based buprenorphine treatment for HIV patients at Boston Medical Center and methadone maintenance treatment at Community Substance Abuse Centers. He is the medical director for the Massachusetts Department of Public Health's Opioid Overdose Prevention Pilot Program. He is the Program Director of the Boston University Addiction Medicine Fellowship program.