Gregory Maurice Marcus MD MAS FACC FAHA FHRS

Cardiac Electrophysiology, Interventional Cardiology, Non-Invasive Cardiology

Professor of Medicine in Residence, UCSF School of Medicine; Associate Chief of Cardiology for Research, UCSF Health; Endowed Professor of Atrial Fibrillation Research, UCSF

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505 Parnassus AveSan Francisco, CA 94143
Phone+1 415-353-8870
Fax+1 415-476-4150

Education & Training

University of California (San Francisco)Fellowship, Clinical Cardiac Electrophysiology, 2005 - 2006
University of California (San Francisco)Fellowship, Cardiovascular Disease, 2002 - 2005
Stanford Health Care-Sponsored Stanford UniversityResidency, Internal Medicine, 1998 - 2001
George Washington University School of Medicine and Health SciencesClass of 1998

Certifications & Licensure

CA State Medical License 1999 - 2026
American Board of Internal Medicine Clinical Cardiac Electrophysiology

Awards, Honors, & Recognition

Member Association of University Cardiologists, 2022
Member American Society of Clinical Investigation, 2022
Fellow Heart Rhythm Society, 2011
Fellow American Heart Association, 2010
CMS Meaningful Use Stage 1 Certification EpicCare Ambulatory EMR, Epic Systems Corporation, 2012-2013
Super Doctor SuperDoctors.com
Fellow (FACC) American College of Cardiology
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Clinical Trials

Transseptal Needle Versus Radiofrequency Energy for Left Atrial Access Start of enrollment: 2010 Nov 01
Completed
Not Applicable
Vest Prevention of Early Sudden Death Trial and VEST Registry Start of enrollment: 2008 Jul 01
Completed
Not Applicable
Study of Left Atrial Appendage Closure in Patients With Atrial Fibrillation - III Start of enrollment: 2012 Sep 01
Withdrawn
Phase 4
The HOLIDAY (HOw ALcohol InDuces Atrial TachYarrhythmias) Study Start of enrollment: 2012 Sep 01
Completed
Not Applicable
Individualized Studies of Triggers of Paroxysmal Atrial Fibrillation Start of enrollment: 2019 Mar 20
Completed
Not Applicable
Coffee and Real-time Atrial and Ventricular Ectopy Start of enrollment: 2019 May 01
Completed
Not Applicable
Transseptal vs Retrograde Aortic Ventricular Entry to Reduce Systemic Emboli Start of enrollment: 2019 Jul 02
Completed
Not Applicable
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Publications & Presentations

PubMed

What Is a Pacemaker?
Albert Liu, Gregory M Marcus
JAMA. 2025-06-05
Association of Endothelial Dysfunction With Chronic Marijuana Smoking and THC-Edible Use.
Leila Mohammadi, Mina Navabzadeh, Nerea Jiménez-Téllez, Daniel D Han, Emma Reagan
JAMA Cardiology. 2025-05-28
Illicit stimulants and ventricular arrhythmias: a longitudinal cohort study.
Jean Jacques Noubiap, Thomas A Dewland, Gabrielle C Montenegro, Hannah H Oo, Zian H Tseng
European Heart Journal. 2025-05-07

Journal Articles

Surface ECG and Intracardiac Spectral Measures Predict Atrial Fibrillation Recurrence After Catheter Ablation
Byron Lee, Nitish Badhwar, Vasanth Vedantham, Tomos E Walters, Randall Lee, Edward P Gerstenfeld, Gregory M Marcus, Journal of Cardiovascular Electrophysiology

Authored Content

Illicit Stimulant Use Raises Risk for Ventricular Arrhythmias, MortalityMay 2025

Press Mentions

Marijuana, Smoking or Edibles, Harms Heart HealthMay 29th, 2025
Ventricular Arrhythmias More Likely to Strike Users of Meth, CocaineMay 9th, 2025
Illicit Stimulant Use Raises Risk for Ventricular Arrhythmias, MortalityMay 8th, 2025
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Grant Support

Digital Interventions to Study and Influence the Alcohol-Atrial Fibrillation ConnectionUNIVERSITY OF CALIFORNIA, SAN FRANCISCO2024–2029
Applying Digital Health to the AF Ablation NCDR, Enabling Longitudinal Follow-upUNIVERSITY OF CALIFORNIA, SAN FRANCISCO2021–2026