Request an Appointment
Get a Second Opinion
Best Children's Hospitals US News & World Report 2025-26
World's Best Specialized Hospitals Newsweek 2026

Meet Our Team

Attendings

John K. Triedman, MD

John K. Triedman , MD

Chief Emeritus, Division of Electrophysiology; Senior Cardiologist, Department of Cardiology
Professor of Pediatrics, Harvard Medical School
Dominic J.R. Abrams, MD, MRCP

Dominic J.R. Abrams , MD, MRCP

Co-Director, Cardiovascular Genetics Center; Senior Associate Cardiologist, Department of Cardiology
Associate Professor of Pediatrics, Harvard Medical School
Mark Alexander, MD

Mark Alexander , MD

Director, Exercise and Sports Cardiology; Senior Cardiologist, Department of Cardiology
Associate Professor of Pediatrics, Harvard Medical School
Elizabeth DeWitt, MD

Elizabeth DeWitt , MD

Medical Director, Surgical Electrophysiology Program; Associate Cardiologist, Department of Cardiology
Assistant Professor of Pediatrics, Harvard Medical School
Douglas Mah, MD

Douglas Mah , MD

Chief, Division of Electrophysiology; Tommy Kaplan Family Chair in Pediatric Cardiology; Director, Pacemaker and ICD Program; Senior Associate Cardiologist, Department of Cardiology
Edward O'Leary, MD

Edward O'Leary , MD

Co-Director, Adult Congenital Heart Disease Electrophysiology; Associate Cardiologist, Department of Cardiology
Assistant Professor of Pediatrics, Harvard Medical School

Fellows

Zachariah Hale, MD

Zachariah Hale, MD

Electrophysiology Fellow, Department of Cardiology
Pierre-Olivier Veillette, MD

Pierre-Olivier Veillette, MD

Electrophysiology Fellow, Department of Cardiology

Nurses

Administrative

Maria Clemente

Maria Clemente

Senior Administrative Assistant, Department of Cardiology
Faceless Avatar - Female

Sanida Henderson

Senior Patient Experience Representative, Department of Cardiology
Julia Santagati

Julia Santagati

Lead Patient Experience Representative, Department of Cardiology