Grant Nash Colfax, MD Director of Health San Francisco Department of Health

Grant Colfax, MD, is Director of Health for the City and County of San Francisco.  For the past thirty years, Dr. Colfax has strived to improve health and wellness through his work in clinical medicine, research, policy and administration. A graduate of Harvard Medical School, he completed his residency in Internal Medicine at the University of California, San Francisco. In 1997, he joined the San Francisco Department of Public Health where his focus was on researching and implementing HIV prevention interventions. As Director of HIV Prevention and Research, he emphasized bringing an evidence-based, community-informed approach to addressing gaps in HIV care and prevention.

From 2012 to 2014 he was a member of the Obama Administration, serving as Director of the Office of National AIDS Policy. As the President’s primary adviser on domestic HIV policy, he coordinated Federal efforts to implement the National HIV/AIDS Strategy. From 2015 to 2019 he was Director of Marin County’s Health and Human Services, leading the Public Health, Social Services and Behavioral Health divisions, with a focus of increasing health and wellness equity in Marin.

He became director of the San Francisco Department of Public Health in February 2019, overseeing the city’s largest department with a $2.3 billion dollar budget and more than 8,000 employees, including Zuckerberg San Francisco General Hospital, Laguna Honda Hospital, 14 primary care clinics, behavioral health services, and population health and prevention.


Tomás Aragón, MD, DrPH
Health Officer and Director, Population Health Division
San Francisco Department of Health

Dr. Aragón is the health officer of the City & County of San Francisco, and director of the Population Health Division (PHD) at the San Francisco Department of Public Health. Striving to embody and promote the universal values of humility, compassion, equity and dignity, he works to convene, connect, and catalyze communities and institutions to transform narratives, policies, and systems toward a sustainable culture of equity, healing and health for all people and our planet. As health officer, he exercises leadership and legal authority to protect and promote equity and health. As PHD director, he directs public health services.

He teaches population health data science (with R) at the UC Berkeley School of Public Health and he maintains a public health blog with a focus on population health equity, leadership, lean, and data science. His curriculum vitae is available here.