Cancer Center

NewYork-Presbyterian Hudson Valley Hospital

Cheryl R. Lindenbaum
Comprehensive Cancer Center

Your Cancer Care Team

Bringing Top Experts To Your Community

A cancer diagnosis can be an overwhelming experience for patients and their families. At NewYork-Presbyterian Hudson Valley Hospital’s Cheryl R. Lindenbaum Comprehensive Cancer Center, our experienced and compassionate cancer care team guides and supports you through every phase of your cancer journey.

Our highly experienced, board-certified physicians are from ColumbiaDoctors, the faculty practice of Columbia University Irving Medical Center, who are members of the Herbert Irving Comprehensive Cancer Center, one of only three National Cancer Institute-Designated Comprehensive Cancer Centers in New York State. We offer access to the best and brightest people and resources in cancer care today, enabling you to benefit from the latest breakthroughs in diagnosis, treatment, testing and survivorship.

Your Cancer Care Team Includes:

  • Board-certified medical oncologists, radiation oncologists, surgical oncologists, radiologists, interventional radiologists and pathologists
  • Magnet award-winning oncology nurses, each with 10+ years of experience
  • Certified nurse practitioners, physician assistants and radiation therapists
  • Patient navigators who provide you with guidance, education and coordination of care tailored to your personalized needs
  • Social workers who provide you with information about in-home, family and medical services
  • Pharmacy staff with experience and knowledge of oncology medications including chemotherapy drugs and immunotherapy agents
  • Referrals to genetic counselors who provide cancer risk assessments and can help you decide whether you or your family members should be tested
  • Palliative care practitioners who help you cope with the symptoms of cancer and its treatment
  • Nutritionists who specializes in the unique nutritional needs of people with cancer and cancer survivors
  • Physical therapists and other rehabilitation specialists to support your recovery
  • Survivorship care providers to guide you in the transition from active treatment to a return to wellness

Meet Our Doctors

Medical Director


Ahmad Raza, MD, MHA

Ahmad Raza, MD, MHA

Dr. Raza is the medical director of the Cheryl R. Lindenbaum Comprehensive Cancer Center at NewYork-Presbyterian Hudson Valley Hospital and an assistant professor of medicine in the division of hematology and oncology at Columbia University Vagelos College of Physicians and Surgeons. Prior to joining NewYork-Presbyterian Hudson Valley, Dr. Raza served as medical director of community oncology and led a large oncology practice at the University of Minnesota Health.

Dr. Raza has clinical expertise in thoracic oncology and head and neck cancer, and his research has focused on developing less toxic and more effective cancer treatments. He has been published in several peer-reviewed journals and strives to broaden access to cancer care for underserved populations. He is board certified in medical oncology, hematology and internal medicine, and completed fellowship training in hematology and medical oncology at the University of Minnesota.

Medical Oncology


J. Gregory Mears, MD

J. Gregory Mears, MD

Dr. Mears is a board-certified Medical Oncologist and Hematologist and is a Clinical Professor of Medicine at NewYork-Presbyterian Columbia University Irving Medical Center. After receiving his medical degree at the Columbia University College of Physicians & Surgeons, Dr. Mears completed his internal medicine residency at Boston University Medical Center and his hematology-medical oncology fellowship at NewYork-Presbyterian Columbia University Irving Medical Center. Dr. Mears cares for people with blood disorders with an emphasis on leukemia, non-Hodgkin’s lymphoma, Hodgkin’s disease, and multiple myeloma. He also has a strong clinical interest in breast cancer and is pursuing clinical research in the fields of Hodgkin’s and non-Hodgkin’s lymphoma.

Mark B. Stoopler, MD, FACP

Mark B. Stoopler, MD, FACP

Dr. Stoopler is a board-certified Medical Oncologist and Associate Professor of Medicine at Columbia University. Dr. Stoopler graduated from Weill Cornell Medical College and completed his fellowship in medical oncology at Memorial Sloan Kettering Cancer Center. He serves as Co-Director of the Thoracic Oncology Tumor Board at Columbia University Irving Medical Center. Dr. Stoopler specializes in thoracic oncology, including lung cancer, mesothelioma and other chest tumors, as well as esophageal cancer and gastric cancer. He is a member of the International Association for the Study of Lung Cancer, the International Society of Gastrointestinal Oncology and the American Federation for Medical Research.

Radiation Oncology


Lawrence Koutcher, MD

Lawrence Koutcher, MD
Medical Director of Radiation Oncology, Cheryl R. Lindenbaum Comprehensive Cancer Center

Lawrence Koutcher, MD, is the Regional Director of Clinical Operations for Radiation Oncology at NewYork-Presbyterian Hudson Valley Hospital (NYP-HVH) in Cortlandt Manor, New York, and NewYork- Presbyterian Lawrence Hospital (NYP-LH) in Bronxville, New York. He also sees patients in Cold Spring, New York. He is an assistant professor of radiation oncology at Columbia University Irving Medical Center. He is chair of the cancer committee and serves on the medical board at NYP-HVH.

Dr. Koutcher earned his BA in biochemistry from Columbia University and his MD from Cornell University, where he received a National Cancer Institute fellowship. He completed his radiation oncology residency at Memorial Sloan Kettering Cancer Center, where he served as chief resident. Previously, he was the medical director of Professional Radiation Oncology Services and of the Herb and Sue Ann Redl Center for Cancer Care in Poughkeepsie, New York.

Leah M. Katz, MD, MPH

Leah M. Katz, MD, MPH

Leah M. Katz, MD, MPH is a board-certified radiation oncologist at NewYork-Presbyterian Hudson Valley Hospital and assistant professor of radiation oncology at Columbia University Irving Medical Center. She sees patients at NewYork-Presbyterian Hudson Valley Hospital Cheryl Lindenbaum Comprehensive Cancer Center in Peekskill, New York.

Dr. Katz actively treats breast cancer, offering intraoperative radiation therapy (IORT), gynecological cancer, and gastrointestinal cancer. Additionally, she provides treatment for lung cancer, offering stereotactic radiation therapy (SBRT), brain cancer, benign diseases of the brain, and brain metastases, offering stereotactic radiosurgery (SRS). She also offers palliative radiation oncology for metastatic disease. Dr. Katz is an active member of the breast and gynecological research teams, and recently received an NRG Oncology grant to study sexual health in underrepresented women receiving pelvic radiation.

Hematologist and Oncologist


Vinit Karur, MD

Vinit Karur, MD

Vinit Karur, MD, PhD, is a hematologist and oncologist at NewYork-Presbyterian Medical Group Hudson Valley and an assistant professor of medicine at Columbia University Medical Center. His has a clinical focus in lung cancer, breast cancer, genitourinary cancer, and GI malignancy, with an interest in melanoma, lymphomas, multiple myeloma, leukemia, and blood disorders. Dr. Karur has a multidisciplinary, team approach to care to make standard treatment and research protocols available to his patients.

Dr. Karur completed his fellowship in hematology and Oncology at Temple University Hospital and Fox Chase Cancer Center in Philadelphia, Pennsylvania. He served his internship and residency at Abington Memorial Hospital in Abington, Pennsylvania. After graduating from the Medical College of Baroda in India, Dr. Karur earned his PhD from the University of Maine. Prior to arriving at Columbia, he has been in hospital based and elective practice in Texas and New Jersey.

Nurse Practitioner


Zylma Flores-Mercado, NP

Zylma Flores-Mercado, NP

Zylma Flores-Mercado, MSN, FNP-BC, is a nurse practitioner specializing in oncology care at NewYork-Presbyterian Medical Group Hudson Valley, affiliated with NewYork-Presbyterian Hudson Valley Hospital. She works in collaboration with cancer center director, Dr. Ahmad Raza, and his team of medical and radiation oncologists to provide critical care to cancer patients.

Zylma earned her master of science in nursing from the College of Mount Saint Vincent in Bronx, New York, and has been working in hospital settings for more than ten years.

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Cheryl R. Lindenbaum Comprehensive Cancer Center

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