Cardiothoracic surgeon Tammy L. Gleeson, D.O. completed a cardiovascular and thoracic surgery fellowship at Bi-County Community Hospital in Warren, an affiliate of Henry Ford Hospital. Prior to that, she completed a general surgery residency at St. John – Detroit Riverview Hospital and an internship at Bi-County Community Hospital. She was trained in osteopathic medicine at Kirksville (Missouri) College of Osteopathic Medicine and earned a bachelor’s degree at the University of Michigan.