Cardiology of Virginia was started in 1998 by Dr. Mark Johns and it continues today as an independently owned practice. The physicians of Cardiology of Virginia take excellent care of their patients and care about their well-being. Our physicians are what sets us apart from other practices. We have three physicians at our Midlothian, Virginia based cardiology office, Dr. Mark Johns, Dr. Edson De Guzman and Dr. Mark Xenakis. You can count on our professional physicians to care for all your cardiac needs.