Dr. Wrenn is Vice-Chairman of the Department and is also the Residency Director. Dr. Wrenn's original training was in Internal Medicine at Emory University. After spending a number of years in private practice, he returned to academics. Dr. Wrenn is board certified in Internal Medicine and Emergency Medicine. He has many research interests including alcohol-related emergencies, metabolic acidosis, asthma, rhabdomyolysis, ethics and ischemic heart disease. Dr. Wrenn has published more than 100 journal articles and editorials in such journals as the Annals of Emergency Medicine, Academic Emergency Medicine, New England Journal of Medicine, Annals of Internal Medicine, Lancet and the American Journal of Medicine. At Vanderbilt Dr. Wrenn serves on the Ethics Committee, the Graduate Medical Education Committee and the Pharmacy and Therapeutics Committee.