Marisa Siebel, MD

About Me

I am a board-certified internist and medical oncologist with special expertise in the diagnosis and treatment of patients with cancers of the head and neck and gastrointestinal malignancies. I collaborate with a multidisciplinary team of physicians, surgeons, radiation oncologists, pathologists, and radiologists to bring the best possible care to patients who wish to be treated close to home on Long Island.

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To provide optimal care for patients with gastrointestinal or head and neck cancer, it is often necessary to coordinate care with other specialists such as speech and swallow therapists, nutritionists, physical therapists, and social workers. We are fortunate at Memorial Sloan Kettering Commack to have access to these resources, ensuring that patients receive state-of-the-art cancer care in a safe and supportive environment.

In addition to my work as a clinician, I have a strong interest in clinical research. I am a co-investigator on several clinical trials available to our patients at the Commack facility. Additionally, I can facilitate patients’ entry into trials that are open only at Memorial Sloan Kettering’s main campus in Manhattan. I enjoy teaching immensely. I am interested in mentoring young physicians and training medical students, residents, and oncology fellows.

I am proud to be part of a dedicated multidisciplinary team that provides comprehensive care at Memorial Sloan Kettering’s regional care facility in Commack, Long Island. My goal is to provide state-of-the-art, compassionate care to all of our patients at Memorial Sloan Kettering in Commack.

  • Clinical Expertise: Gastrointestinal Malignancies; Head and Neck Cancers
  • Languages Spoken: English
  • Education: MD, St. George's University Medical School
  • Residencies: Maimonides Medical Center (New York)
  • Fellowships: University of Vermont, Fletcher Allen Health Care Medical Center
  • Board Certifications: Internal Medicine; Medical Oncology; Hematology

New Patient Appointments

Making an appointment

Call 800-525-2225

Clinical Trials

As home to one of the world’s top cancer research centers, Memorial Sloan Kettering is typically involved in more than 900 clinical trials at a given time. Currently, clinical trials focused on the conditions I treat are enrolling new patients. If you’re interested in joining a clinical trial, click to learn about the trial’s purpose, eligibility criteria, and how to get more information.

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