She joined MSF in 2007 and has undertaken field assignments as a field physician, medical team lead, and medical coordinator in Zimbabwe and Sudan. Dr. Ludwig completed a fellowship in applied medical epidemiology through the Epidemic Intelligence Service and the Centers for Disease and Control Prevention. She has worked as a research coordinator on HIV public health research projects in East Africa through the University of California, San Francisco, and in the domestic tuberculosis program for the City of San Francisco. Currently she is physician chief of medical practice at a large primary care clinic at the San Francisco VA Medical Center, where she teaches residents, manages medical operations, and cares for veterans.