Douglas Ebersole, MD, is an interventional cardiologist at the Watson Clinic LLP in Lakeland, Florida and is the Director of the Structural Heart Program at Lakeland Regional Health. He has been diving since 1974 and is an avid recreational diver, technical diver, rebreather diver, and cave diver. He is also a recreational, technical, and rebreather instructor for several training agencies, is a cardiology consultant to Divers Alert Network, RAID medical advisor, and is the Florida Sales agent for KISS Rebreathers.