Rivera, Juan: - Juan Rivera, MD, MHS, is a board-certified internist and cardiologist who trained at Johns Hopkins University Hospital. He specializes in the prevention, early detection, and treatment of cardiovascular diseases. He is an indisputable leader in his field in the Hispanic community, the chief medical correspondent for Univision Network and the host of the Dr. Juan show, a weekly one-hour health program on Univision. He is also an assistant professor of Medicine at Columbia University in New York. Through his concierge practice in Miami, he sees patients that include celebrities, business leaders, and athletes from around the world.