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J. Isabelle Choi, MD

Director of Research, Clinical Director

Dr. Isabelle Choi is the Director of Research and Clinical Director at the New York Proton Center.  She is appointed to national and international leadership positions in both the proton therapy and conventional photon therapy communities. She is also a Radiation Oncology Attending in the Department of Radiation Oncology at Memorial Sloan Kettering Cancer Center.


→ Breast cancers

→ Gastrointestinal (GI) cancers



Harvard University

Medical School

University of Texas Health Science Center School of Medicine


Kaiser Permanente Los Angeles Medical Center (Chief Resident)

Board Certifications

Radiation Oncology


Dr. Choi’s research focuses on improving outcomes, reducing toxicities and more effectively delivering radiotherapy for breast and gastrointestinal malignancies.

Leadership Appointments

Among her select national leadership appointments, Dr. Choi is Chair of the Proton Collaborative Group Publications Committee and Breast Subcommittee, is Chair of the National Association of Proton Therapy’s Physician Advisory Committee, and is the President of the Korean American Society of Radiation Oncology.

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Latest Blog
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The Promise of Proton Therapy for Breast Cancer

How can we help?

Want to find out if proton therapy might be a good fit for you or your patient? Call us at 833-NYPROTON (833-697-7686) or fill out the appropriate form below.