About Us

Jeff Mangrum


My career at Vanderbilt began as a trauma nurse, which evolved into charge nurse responsibilities. This was my home for seven years. Seeking to do more in the management arena, I pursued the role of Administrative Coordinator. I was tasked with keeping things running smoothly and serving as liaison to those with critical decision making responsibilities. I currently serve as the director of emergency preparedness for Vanderbilt University Medical Center. My education includes a BS from David Lipscomb University, a nursing degree from Columbia State Community College, and a Master of Health Care Administration from the University of St. Francis.

Jason Erlewine


Jason Erlewine is the Emergency Preparedness Coordinator for TriStar Hendersonville Medical Center, an affiliate of Hospital Corporation of America (HCA), and works to maintain compliance with many regulatory agencies . With over 20 years of experience in Emergency Medical Services, Emergency Management and business continuity, he integrates TriStar Hendersonville Medical Center into the community preparedness and response to disaster situations. Jason is a Certified Healthcare Emergency Professional, Certified Explosive and Fire Investigator and has a B.A. in Management from Trevecca University and has worked with various agencies and institutions across the United States to provide training courses to the areas served.

David Wheeler


David Wheeler is System Safety Officer / Emergency Preparedness Coordinator for Medxcel based at Saint Thomas Health, the leading faith-based health care system in Tennessee. Saint Thomas Health is a part of Ascension Health, the largest not-for-profit health care system in the United States. As the system Safety Officer, he oversees the Environment of Care and ensures compliance with many regulatory agencies and governing bodies. Prior to his current position, he served as the Radiation Safety Officer at Saint Thomas Hospital for 10 years. David is a Certified Healthcare Safety Professional (CHSP) with a B.S. degree from Austin Peay in Radiological Sciences.