LGBTQ-Knowledgable Providers

LGBTQ-Knowledgable Providers

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Meet a few of our providers who are  especially knowledgeable about the healthcare needs of LGBTQ+ people.


Koshy Alexander, MD

Full bio.

Philip A. Bialer, MD

Dr. Bialer is a psychiatrist who cares for people with cancer and HIV/AIDS. He also has expertise in treating patients with substance use disorders. Full bio.

Kathleen N.S. Cathcart, MD

Dr. Cathcart is a medical oncologist with MSK’s Urgent Care Center, which provides specialized care for patients with medical emergencies related to cancer and its treatment. Full bio.

Filemon Dela Cruz, MD

Dr. Dela Cruz is a pediatric oncologist who cares for children with sarcomas, including Ewing sarcoma, osteosarcoma, rhabdomyosarcoma, and desmoplastic small round cell tumors. Full bio.

Lisa Diamond, MD, MPH

Dr. Diamond is an internist who works with the Immigrant Health and Cancer Disparities Service at MSK, which facilitates linguistically and culturally sensitive healthcare services for newcomer populations. Full bio.

Barbara C. Egan, MD

Dr. Egan is Chief of the Hospital Medicine Service at Memorial Sloan Kettering, where she specializes in delivering comprehensive medical care to people who are hospitalized. Full bio.

Mark B. Geyer, MD

Dr. Geyer is a hematologic oncologist who specializes in caring for people with leukemia. He also studies new ways to use immunotherapy to treat leukemias. Full Bio.

Jeffrey S. Groeger, MD

Dr. Groeger is an internist with expertise in critical care medicine who serves as Chief of MSK’s Urgent Care Service. Full bio.

Jennifer Heinen, MD

Dr. Heinen is a hospitalist who is focused on providing high-quality medical care, with an emphasis on quality of life and relief of suffering. Full bio.

Marissa Karpoff, MD

Dr. Karpoff is a nocturnist at Memorial Sloan Kettering, where she specializes in delivering comprehensive medical care to people who are hospitalized during overnight hours.

Douglas J. Koo, MD, MPH, FACP

Dr. Koo is an academic hospitalist with expertise in internal medicine, hospice, and palliative medicine. He is an attending physician on the General Medicine and Gastrointestinal Oncology Services. Full bio.

Chhavi Bansal Kumar, MD

Dr. Kumar is internist who cares for patients with gastrointestinal malignancies. She is also the assistant director of quality improvement for the Division of General Medicine at MSK. Full bio.

Rekha Parameswaran, MD

Dr. Parameswaran is hematologist and oncologist who cares for cancer patients with disorders of the coagulation system. She is currently chair of the hemostasis study group of the Multinational Association of Supportive Care in Cancer. Full bio.

Cori Salvit, MD

Dr. Salvit is a hospitalist who cares for patients on the Gastrointestinal Oncology and General Medicine Services. She also directs MSK’s Transitional Year Residency Program. Full bio.

Nelson Sanchez, MD

Dr. Sanchez is as an urgent care physician at Memorial Sloan Kettering who is very active in LGBTQ+ initiatives. He leads institution-wide LGBT safe zone trainings for clinicians. Full bio.