Tomás J. Aragón, MD, DrPH

Tomás J. Aragón, MD, DrPH 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. As health officer, he exercises leadership and legal authority to protect and promote health. As PHD director, he directs public health services. His focus areas include health equity, lean enterprise transformation, data science, collective impact, and leadership development to tackle complex organizational and community challenges. He teaches epidemiologic R programming/data science at the UC Berkeley School of Public Health, and maintains two blogs Population Health Data Science ( and Population Health Lean (