David K. Tan, M.D., EMT-T, FAEMS, is associate professor and chief of EMS in the division of emergency medicine at Washington University School of Medicine in St. Louis. He is double board-certified in Emergency Medicine and EMS Medicine by the American Board of Emergency Medicine. Dr. Tan remains very active in EMS at the local, state and national levels as an operational medical director for local police, fire, and EMS agencies, Vice-chairman of the Missouri State Advisory Council on EMS, and President-Elect of the National Association of EMS Physicians. Dr. Tan is a member of the EMS1 Editorial Advisory Board. He also provides medical direction to EMS1.com and the EMS1 Academy.