He is also a practicing Internist at NewYork-Presbyterian Hospital/Columbia University Medical Center, and holds a non-clinical appointment as an Associate Physician in the Division of Global Health Equity at the Brigham & Women's Hospital and as an Affiliate of the Program in Global Primary Care & Social Change at Harvard Medical School. His work focuses on the intersection of global health and primary health care, with a particular emphasis on health systems and implementation science. He has more than a decade of experience working on health care delivery, primary health care, and implementation research in low-income settings.