Steven M. Horwitz, MD

Steven M. Horwitz, MD

Lymphoma Specialist & Cellular Therapist

Areas of Expertise

Conditions I Treat

  • Lymphoma
  • Non-Hodgkin lymphoma (NHL)
  • Follicular zone lymphoma

My Specialties

  • Cellular therapy
View more expertise
Dr. Horwitz's Office Information
Languages: English
Request an Appointment
Our Care Advisors can answer many of your questions. They will connect you with the best healthcare provider for your needs.

Get to Know Me

I am a medical oncologist who focuses on the care of patients with lymphoma, and I have clinical expertise in all types of lymphomas. My research is aimed at developing an improved understanding of new therapies for patients with several less-common types of lymphoma, including T cell lymphomas, cutaneous (skin) lymphomas, Hodgkin disease, and lymphomas in immunosuppressed patients after organ transplant (post-transplant lymphoproliferative disorders or PTLD).

What I Do at MSK

I'm a lymphoma specialist, which is a doctor with special training in diagnosing and treating lymphoma (lim-FOH-muh). This cancer starts in the cells of the immune system.

A cellular therapy specialist is a doctor with special training in using cell therapies to treat health conditions such as cancer. Therapies can include chimeric antigen receptor (CAR) T cell therapy.

  • Endowed Chair, The Nonna’s Garden Foundation Chair, With Gratitude to Memorial Sloan Kettering
Areas of Expertise

Conditions I Treat

  • Lymphoma
  • Non-Hodgkin lymphoma (NHL)
  • Follicular zone lymphoma
  • Diffuse large b-cell lymphoma (DLBCL)
  • Marginal zone lymphomas
  • Mantle cell lymphoma (MCL)
  • Small lymphocytic lymphoma (SLL)
  • Chronic lymphocytic leukemia (CLL)
  • Hodgkin lymphoma (Hodgkin’s disease)
  • Peripheral T-cell lymphomas
  • Burkitt lymphoma

My Specialties

  • Cellular therapy
Education & Honors

Education

  • MD, Case Western Reserve University

Residencies

  • Internal Medicine - University of Rochester/Strong Memorial Hospital

Fellowships

  • Medicine - Stanford University Medical Center

Board Certifications

  • Internal Medicine
  • Medical Oncology

Awards and Honors

  • Castle Connolly: America’s Top Doctor (2025)
  • Castle Connolly: America’s Top Doctor (2024)
  • Top Doctors New York Metro Area, Castle Connolly (2023)
  • Castle Connolly: America's Top Doctors (2023)
  • Castle Connolly: New York Magazine Top Doctors (2013-2021)

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.

Don't see your carrier or plan? We can help you understand your coverage.

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.

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

Make an Appointment

Women talking
New Patients
Scheduling an appointment is easy. Click or call 646-497-9137— we’re available 24 hours a day, 7 days a week
Make an Appointment
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
Get Directions

Looking to see a doctor at a different location? See all MSK locations.

Clinical Trials

Smiling doctors in the lab
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

Publications on PubMed

Visit PubMed for a full listing of Dr. Horwitz’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.

Steven M. Horwitz discloses the following relationships and financial interests:

  • Arvinas, Inc.
    Professional Services and Activities
  • Baptist Health Miami Cancer Institute
    Professional Services and Activities
  • Cutaneous Lymphoma Foundation
    Fiduciary Role / Position
  • DKMS
    Fiduciary Role / Position
  • Dren Bio
    Professional Services and Activities
  • Indy Hematology Education, Inc.
    Professional Services and Activities
  • International Society for Cutaneous Lymphomas
    Fiduciary Role / Position
  • Johnson & Johnson
    Professional Services and Activities
  • Kyowa Hakko Kirin Pharma
    Professional Services and Activities
  • Medscape
    Professional Services and Activities
  • National Comprehensive Cancer Network
    Fiduciary Role / Position
  • OncLive
    Professional Services and Activities
  • Ono Pharma
    Professional Services and Activities
  • Physicians' Education Resource
    Professional Services and Activities
  • Plexus Communications
    Professional Services and Activities
  • Saudi Lymphoma Group
    Professional Services and Activities
  • Scholars in Medicine
    Professional Services and Activities
  • Secura Bio, Inc.
    Professional Services and Activities
  • Shoreline Biosciences, Inc.
    Professional Services and Activities
  • Society of Hematologic Oncology
    Professional Services and Activities (Uncompensated)
  • SymBio Pharmaceuticals Limited
    Professional Services and Activities
  • Takeda Pharmaceuticals
    Professional Services and Activities
  • Treeline Biosciences, Inc.
    Professional Services and Activities (Uncompensated)

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, 2024 through disclosure submission in spring 2025). 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 ecoi@mskcc.org.


View all disclosures

Related topics: