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About John Keller

Dr. John Keller, MD, is a cardiologist who focuses on Issues dealing with the heart’s ability to properly pace itself, including cardiac arrhythmias. This type of cardiologist is known as an electrophysiologist. As an expert electrophysiologist, Dr. Keller focuses on treating irregular heart pacing patterns through medical treatments performed in the cath lab or devices such as pacemakers. Dr. Keller sees patients at Adena Health Pavilion in Chillicothe, Ohio, and Adena Health Center in Washington Court House, Ohio.

Specializing in cardiac electrophysiology, Dr. Keller analyzes, diagnoses, and treats electrical activities of the heart. His main areas of interest are arrhythmias. He has a decade of  experience in performing ablation—a procedure to correct structural issues in the heart that cause arrhythmias—and cardiac device implants, including pacemakers and implantable cardioverter defibrillators (ICDs). Heart arrhythmias occur when the heart beats irregularly.

As a cardiologist and electrophysiologist, Dr. Keller is uniquely trained to diagnose and treat a multitude of cardiac events, including heart disease and atrial fibrillation (also referred to as AFib), an arrhythmia that can lead to heart failure, stroke, and other cardiac complications.

Learn more about the Adena Heart and Vascular Center



University of Cincinnati College of Medicine, Cincinnati, Ohio
Medical School
The Ohio State University Medical Center, Department of Internal Medicine
The Ohio State University Medical Center, Department of Internal Medicine

Board Certifications

Board Certified Cardiac Electrophysiology, Board Certified Cardiovascular Disease, Board Certified Internal Medicine


Cardiology Fellowship, The Ohio State University Medical Center,Electrophysiology Fellowship, The Ohio State University Medical Center

Professional Memberships

American Medical Association, American College of Cardiology

Office Locations

Map of Adena Health Pavilion

Primary Office

Adena Health Pavilion

272 Hospital Road
Chillicothe, OH 45601
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