Jeffrey Zwicker

Jeffrey Zwicker, MD

Hematologist

Areas of Expertise

Conditions I Treat

  • Deep vein thrombosis (DVT)
  • Pulmonary embolism
  • Blood disorders and hemoglobinopathies

My Specialties

  • Hematology
  • Managing symptoms of cancer treatment
  • Anticoagulation
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Dr. Zwicker's Office Information
Languages: English
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Get to Know Me

As Chief of the Hematology Service at Memorial Sloan Kettering Cancer Center (MSK), I lead a team of hematologists that cares for more than 4,000 patients with benign (non-cancerous) blood disorders every year.

We provide personal care that is tailored to each person’s needs and preferences. We also place a strong emphasis on compassion, clear communication, and attention to each person’s situation.

Often, patients have questions about the complications related to treatment of blood cancers or blood disorders. This includes the chance of these complications, potential side effects, and how long a specific treatment will take. We provide clear explanations so you understand what to expect and take the time address your concerns. 

In patients with cancer, blood-related disorders, such as blood clots, low blood counts including anemia, and bleeding disorders, which may require special attention, regardless of whether the disorder is pre-existing, or a side effect of cancer treatment. Patients who already had a blood disorder before they were diagnosed with cancer might need tailored therapies.

Sometimes, patients receiving cancer therapy will experience blood-related side effects. These can include blood clots that form in a deep vein (deep vein thrombosis [DVT]) or decreases in the number of platelets in the blood (thrombocytopenia). Cancer-associated thrombosis is a condition that can develop when someone is undergoing treatment for cancer. Beyond caring for existing blood-related disorders, the Hematology Service also provides prompt medical attention to address any blood-related side effects, including thrombosis.

In addition to caring for patients with benign blood disorders, I study cancer-associated thrombosis to better understand its risk factors and develop novel treatment approaches. To date, I have led several National Institutes of Health-funded studies in cancer-associated thrombosis. I currently serve as the Chair of the International Society on Thrombosis and Haemostasis. Inc.’s (ISTH) subcommittee on hemostasis and thrombosis. I also previously acted as the Vice-Chair and Chair of the American Society of Hematology’s subcommittee on thrombosis and vascular biology. Through research and leadership in national and international professional organizations dedicated to thrombosis, I hope to improve the prevention and treatment of cancer-associated thrombosis.

 

What I Do at MSK

I'm a hematologist (HEE-muh-TAH-loh-jist), which is a doctor with special training in blood disorders.

  • Chief, Hematology Service
Areas of Expertise

Conditions I Treat

  • Deep vein thrombosis (DVT)
  • Pulmonary embolism
  • Blood disorders and hemoglobinopathies
  • Anemia and cancer
  • Blood clots and cancer
  • Thrombocytopenia and other bleeding disorders
  • Pulmonary conditions
  • Complications of cancer

My Specialties

  • Hematology
  • Managing symptoms of cancer treatment
  • Anticoagulation
This list shows some key areas of focus, but it may not cover all expertise. When making an appointment, you will be matched with the best healthcare provider for your needs.
Education & Honors

Education

  • MD, Penn State College of Medicine
  • MMS, Harvard Medical School

Residencies

  • Intern and Resident, Beth Israel Deaconess Medical Center, Harvard Medical School

Fellowships

  • Hematology/Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School

Board Certifications

  • Hematology

Awards and Honors

  • Hematology Fellowship Teaching Award, Memorial Sloan Kettering Cancer Center (2026)
  • Simon Karpatkin Plenary Lectureship, International Conference on Thrombosis and Hemostasis Issues in Cancer (2026)
  • Associate Editor, Journal of Thrombosis and Haemostasis (2022–present)
  • Medical & Scientific Advisory Board Member, National Blood Clot Alliance (2021–present)
  • Gordon J. Strewler Mentorship of Resident Research Award, Department of Medicine, Beth Israel Deaconess Medical Center (2021)

Insurance Information

Understanding your insurance options is an important part of managing your cancer care. We have relationships with many common healthcare providers and plans.

Learn more about the insurance plans that participate with MSK.

If you don't have health insurance or are worried that your care may not be fully covered, our financial assistance programs may be able to help.

Health plans can change at any time. Call the number on the back of your insurance card to see what your plan covers. Make sure it covers the MSK location where you’ll get care.

If you have questions about insurance, call us at 646-497-9176.

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New Patients
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Current Patients
Request an appointment by calling your Care Team or messaging them in MSK MyChart.

Contact and Location

Office Phone
Location
New York, NY
David H. Koch Center for Cancer Care at Memorial Sloan Kettering Cancer Center
530 East 74th Street New York NY 10021
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Looking to see a doctor at a different location? See all MSK locations.

Colleagues

Doctors at Memorial Sloan Kettering work as teams, with specialists from all different areas. This allows us to consider all your needs together, and to give you the best possible care.

See all Hematology Service doctors

Clinical Trials

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Find a Clinical Trial for You

Memorial Sloan Kettering's doctors and scientists are constantly developing new treatments for cancer. MSK is typically running hundreds of clinical trials at a given time.

You may be able to participate in a clinical trial even if you are new to MSK. Search our online directory to find trial information and see more about who can participate.

Search clinical trials

Research and Publications

View a list of Dr. Zwicker’s publications

Publications on PubMed

Visit PubMed for a full listing of Dr. Zwicker’s journal articles. Pubmed is an online index of research papers and other articles from the US National Library of Medicine and the National Institutes of Health.

See all on PubMed

Disclosures

Members of the MSK Community often work with pharmaceutical, device, biotechnology, and life sciences companies, and other organizations outside of MSK, to find safe and effective cancer treatments, to improve patient care, and to educate the health care community. These activities outside of MSK further our mission, provide productive collaborations, and promote the practical application of scientific discoveries.

MSK requires doctors, faculty members, and leaders to report (“disclose”) the relationships and financial interests they have with external entities. As a commitment to transparency with our community, we make that information available to the public. Not all disclosed interests and relationships present conflicts of interest. MSK reviews all disclosed interests and relationships to assess whether a conflict of interest exists and whether formal COI management is needed.

Jeffrey Zwicker discloses the following relationships and financial interests:

  • American Society of Hematology
    Professional Services and Activities
  • CSL Behring
    Professional Services and Activities
  • International Society on Thrombosis and Haemostasis
    Professional Services and Activities
  • Novartis
    Professional Services and Activities
  • Parexel International
    Professional Services and Activities
  • Regeneron Pharmaceuticals, Inc.
    Professional Services and Activities
  • UptoDate
    Professional Services and Activities

If you’re a patient at MSK and would like more information about your doctor’s external relationships, please talk with your doctor.

The information published here is a complement to other publicly reported data and is for a specific annual disclosure period. There may be differences between information on this and other public sites as a result of different reporting periods and/or the various ways relationships and financial interests are categorized by organizations that publish such data.

This page and data include information for a specific MSK annual disclosure period (January 1, 2025 through disclosure submission in spring 2026). This data reflects interests that may or may not still exist. This data is updated annually.

Learn more about MSK’s COI policies here. For questions regarding MSK’s COI-related policies and procedures, email MSK’s Compliance Office at [email protected].


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