Callsen is the Assistant Chief (Retired) of Operations at Austin-Travis County Emergency Medical Services in Texas. He has a strong combination of expertise in Emergency Medical Services, Homeland Security, and Information/Communications Technology. He has previously served as the Prehospital Co-Chair, of the Texas Governor’s EMS & Trauma Advisory Council, Disaster/Emergency Task Force, Chairman of the Capital Area Council of Governments Homeland Security Task Force. He is also an author of National Incident Management System: Principles and Practices, 1st & 2nd Editions and served as both an Incident Commander and Planning Section Chief on an All-Hazards Incident Management Team. Chief Callsen pursued his education at Georgetown University is Washington, DC, and the John F. Kennedy School of Government at Harvard University.