I am 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, I exercise leadership and legal authority to protect and promote health. As PHD director, I direct public health services. My focus areas include health equity, lean enterprise transformation, collective impact, data science, and leadership development to tackle complex organizational and community challenges. I teach epidemiologic R computing / data science at the UC Berkeley School of Public Health, and maintain this blog focused on population health leadership, lean (PHL), and data science (PHDS) at https://taragonmd.github.io/.