Gregory M. Marcus

MD

Cardiologist and electrophysiologist

Dr. Gregory Marcus is a cardiologist and electrophysiologist who specializes in the diagnosis and treatment of arrhythmias, including cardiac mapping and catheter ablation for atrial fibrillation, supraventricular tachycardias and ventricular arrhythmias. He is also an expert in implanting pacemakers, biventricular devices and defibrillators.

In his research, Marcus studies heart rhythm disturbances, and the health effects of common lifestyle factors such as alcohol, caffeine, smoking and other substances, and leads several large projects to use sensors, smart phones and other technologies to conduct clinical research.

Marcus earned his medical degree from George Washington University School of Medicine & Health Sciences. He completed his residency at Stanford Medicine. He then completed his training in cardiovascular medicine and cardiovascular electrophysiology at UCSF.

  • Education

    George Washington University School of Medicine, 1998

  • Residencies

    Stanford Hospital and Clinics, Internal Medicine, 2002

    UCSF Medical Center, Cardiology, 2004

  • Fellowships

    UCSF Medical Center, Cardiac Electrophysiology, 2006

  • Board Certifications

    Clinical Cardiac Electrophysiology, American Board of Internal Medicine

  • Academic Title

    Professor

Conditions I specialize in

Treatments I provide

Where I see patients (2)

    My reviews

    4.9

    Overall Experience
    119 Ratings
    About our process
    Dec 07, 2024
    I asked the doctor whether it would be safe to stop taking a blood thinner (Eliquis). He discussed the pros and cons and offered to consult with his colleagues as it was a judgment call. He got back to me (through My Chart) that same day with a recommendation. Amazing!
    Nov 02, 2024
    Dr Marcus was so present, answering all my questions with no rush. I felt I was in excellent hands & well cared for.
    Sep 19, 2024
    Care provider knowledgeable and reassuring
    May 13, 2024
    Very professional but also somewhat transactional without much empathy. Just stating the facts without much consideration for me as a person.
    May 06, 2024
    Listened answered all my questionsExcellent
    Mar 30, 2024
    Gregory made me part of the decision making with my care
    Jan 07, 2024
    Dr Marcus and his team were excellent!! He was very helpful. PA was great.
    Dec 23, 2023
    Excellent very professional
    Dec 18, 2023
    Dr. Marcus is an outstanding care provider. He is very thorough, knowledgeable and respectful. He listens carefully to my concerns and questions and addresses these by providing research results as well as his thoughts and experience on whatever issue we are addressing. I feel he sees me as his partner in my health and not just a passive recipient of care.
    Nov 04, 2023
    Getting a good fit with a provider is hard to figure out in advance. I would recommend Dr Marcus without hesitation but explain that he is more focused and efficacious than a nurturing type of physician. This is ok. It's an observation, not a judgment. I am very satisfied with the care received.
    Oct 14, 2023
    I'd like to give him 5 plus.
    Sep 29, 2023
    I don't remember receiving anything about the follow up. It might be in my notes, but I don't have them with me.
    Sep 17, 2023
    I have always been very satisfied with my health care at UCSF.
    Jul 12, 2023
    I have nothing but high regard and respect for UCSF, PERIOD!
    Jun 26, 2023
    Always helpful
    May 15, 2023
    Great experience
    Mar 11, 2023
    I always recommend UCSF to all my family & friends.

    Selected research

    See all research
    Decorative Caduceus

    Full-Avoidance vs. Permissive/Regulated Drinking & Outcomes On Fibrillation

    Participants will be wearing a continuously recording ECG monitor for two weeks. The primary outcome will be the presence (versus absence) of at least one AFib episode on randomly assigned drinking versus non-drinking days.

    Recruiting

    Decorative Caduceus

    Volunteers to Investigate Best Results for Ablation and Novel Therapies for Atrial Fibrillation

    Time to atrial fibrillation, after employing a 3-month blanking period. Atrial Fibrillation Recurrence includes patient-reported symptoms of AF or Kardia-based ECG evidence of AF.

    Recruiting

    Decorative Caduceus

    The MARY-JANE Cannabis and Heart Rhythm Trial

    Participants will be wearing a continuously recording ECG monitor for two weeks. The primary outcome will be change in premature atrial contraction (PAC) and PVC frequency due to cannabis consumption or avoidance during the monito...

    Recruiting

    Decorative Caduceus

    The Heart Rhythm Twins Study

    This will be measured using a wearable EKG monitor.

    Recruiting

    My work

    UCSF study on marijuana legalization finds uptick in drug abuse, decrease in chronic pain reports

    Contact me

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