Dr. Metzger is a practicing interventional cardiologist who serves as director of Holston Valley Medical Center’s diagnostic catheterization and interventional labs. He has helped Holston Valley earn national and international acclaim in cardiology, and his work has led to significant growth in cardiac clinical trials and research. Under Dr. Metzger’s leadership, the cardiology program at Holston Valley has performed as the No. 1 or No. 2 enroller in the United States and globally in at least 29 top research trials, including being the current leading enroller in four major trials. He has also forged a strong professional relationship with Harvard Medical School. Seven times, he has hosted endovascular fellows to train at Holston Valley before completing their education.