About Leon Ptaszek, MD, PhD

Dr. Ptaszek received his M.D. and Ph.D. degrees from the Mount Sinai School of Medicine. He completed his internal medicine residency training at the Stanford University School of Medicine, and then completed fellowships in cardiology and clinical cardiac electrophysiology at the Massachusetts General Hospital. He is board certified in internal medicine, cardiovascular diseases, and clinical cardiac electrophysiology. Dr. Ptaszek is an Assistant Professor of Medicine at Harvard Medical School and MGH.

His clinical interests focus on the management of patients with heart rhythm disorders. Dr. Ptaszek performs catheter ablations of supraventricular tachycardias (SVTs) and premature ventricular contractions (PVCs). He also implants pacemakers, implantable cardioverter-defibrillators (ICDs), and cardiac resynchronization therapy (CRT) devices. His research interests include the development of novel ablation catheters and high-resolution arrhythmia mapping systems.


Departments, Centers, & Programs:

Clinical Interests:



Electrophysiology Lab/Arrhythmia Service
55 Fruit Street
Boston, MA 02114-2696
Phone: 617-724-4500
Phone: 617-726-9292
Fax: 617-724-6747

Waltham: Mass General Waltham

MGH Waltham Heart Center
52 Second Ave
Suite 520
Waltham, MA 02451
Phone: 781-487-6000

Medical Education

  • PhD, Icahn School of Medicine at Mt. Sinai
  • MD, Mount Sinai School of Medicine
  • Residency, Stanford University School of Medicine
  • Fellowship, Massachusetts General Hospital

American Board Certifications

  • Clinical Cardiac Electrophysiology, American Board of Internal Medicine
  • Cardiovascular Disease, American Board of Internal Medicine
  • Cardiovascular Disease, American Board of Internal Medicine

Accepted Insurance Plans

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.