Hematology/Oncology Providers

Gregory Mears, MD

Gregory Mears


J. Gregory Mears, MD, is Board Certified in Hematology/Oncology. Dr. Mears is a Clinical Professor of Medicine at Columbia University Medical Center. After receiving a BS at Trinity College, Dr. Mears obtained his Medical Degree at The College of Physicians and Surgeons, Columbia University. He undertook his Internal Medicine Residency at Boston University Medical Center and his Hematology-medical Oncology Fellowship at Columbia University Medical Center.

Dr. Mears' early career was researched based and involved studies of the molecular genetics of disorders of hemoglobin as well as chronic myelogenous leukemia. For the past 25 years, Dr. Mears has maintained a clinical practice caring for people with blood disorders with an emphasis on leukemia, non-Hodgkin's lymphoma, Hodgkin's disease, and multiple myeloma.

Additionally, Dr. Mears is pursuing clinical research in the fields of Hodgkin's and non-Hodgkin's lymphoma as well as breast cancer. He is also actively engaged in the teaching of medical students, residents, and fellows.

Martin Oster, MD

Martin Oster


Martin W. Oster, MD, a Board-Certified Physician, is an Associate Professor of Medicine at NewYork-Presbyterian/Columbia University Medical Center, where he has been practicing Medical Oncology since 1976. He cares for patients with various malignancies, including breast cancer, gastrointestinal cancers, lung cancer, and head/neck cancer.

Dr. Oster received his Bachelor, summa cum laude and valedictorian, and his Medical Degree, both from Columbia University. His residency in Internal Medicine was completed at Harvard/Massachusetts General Hospital and completed his Medical Oncology Fellowship at the National Cancer Institute.

Dr. Oster is actively involved in all aspects of oncology patient care, as well as participating in clinical research and teaching at Columbia.

Namrata Patel, MD

Namrata Patel


Namrata Patel MD, joins NYP Medical Group/Hudson Valley and NYP/Hudson Valley Hospital, as the Medical Director of the Cheryl R. Lindenbaum Comprehensive Cancer Center.

Dr. Patel, Assistant Professor of Medicine at CUMC, is Board Certified in Medical Hematology/Oncology with over a decade of clinical experience. After graduating Cum Lade from CUNY Medical School, Dr. Patel received her Medical Degree from Mount Sinai School of Medicine, NY, and completed her Internal Medicine Residency at Stony Brook University Hospital, NY. She furthered her education by completing her Hematology/Oncology fellowship at New York University Medical Center, NY.

Dr. Patel cares for patients with various malignancies, including GI malignancies, breast cancer, lung cancer, lymphoma, urologic cancers and hematologic conditions. She practiced previously at Lowell General Hospital Cancer Center in Lowell, MA, where she supervised both inpatient and outpatient cancer center care, in addition to developing a hepatocellular cancer tumor board.

Dr. Patel is tri-lingual, being fluent in English, Gujarati and Spanish.

Mark Stoopler, MD, FACP

Mark Stoopler


Mark B. Stoopler, MD, FACP, Board-Certified Medical Oncology Physician.

Dr. Stoopler received his Bachelors Degree from Tulane University in 1971 and his Medical Degree from Cornell University Medical College in 1975. His Residency was completed at North Shore University Hospital/Memorial Hospital, and his Oncology Fellowship was completed at Memorial Sloan-Kettering Cancer Center in NYC, before joining the Columbia faculty in 1980.

Dr. Stoopler is a Fellow of the American College of Physicians and a member of the American Society of Clinical Oncology, the International Association for the Study of Lung Cancer, the International Society of Gastrointestinal Oncology, the American Federation for Clinical Research and the Southwest Oncology Group. Dr. Stoopler is an Associate Professor of Medicine at Columbia University Medical Center, and is involved in patient care, clinical research, and teaching on the medical oncology service.