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Our Experts

At Montefiore Nyack Hospital, medical oncologists, cancer surgeons and radiation oncologists partner in caring for patients with all types of cancer and blood disorders. Our physicians are board-certified and fellowship trained in oncology, providing patients with the highest level of excellence in cancer care.

In addition to physicians who are cancer experts, our team includes nurse navigators, social workers, dieticians, pharmacists, financial counselors and pastoral care representatives who are also highly experienced in caring for cancer patients.

Our multidisciplinary team meets with newly diagnosed patients to help them through the entire cancer process, from diagnosis and treatment to support and education.

Sung Ho Lee, MD, Sung Ho Lee, MD, is a board-certified medical oncologist and hematologist. He is the Director of Clinical Research at Montefiore Nyack Hospital, bringing cutting-edge oncology therapies to the community. Dr. Lee received his medical degree summa cum laude and completed his internship at Kyunghee University Medical Center in Seoul, South Korea. He completed his residency in internal medicine and postdoctoral training in hematology and medical oncology at Montefiore Medical Center in Bronx, NY. Prior to joining Highland Medical P.C., Dr. Lee was Medical Director of The Infusion Center at Metropolitan Hospital Center in New York, NY. He was a medical oncologist and hematologist at the Mayo Clinic Care Network’s Altru Cancer Center in Grand Forks, ND. Dr. Lee is an Assistant Professor of Medicine at New York Medical College in Valhalla, NY. He is fluent in Korean.


Mathew Lonberg, MD, Mathew Lonberg, MD, is a board-certified medical oncologist and hematologist. He graduated magna cum laude from the University of Pennsylvania with honors in Biochemistry. He earned his medical degree from the University of Virginia School of Medicine, where he was a member of the Alpha Omega Alpha Medical Honor Society. Dr. Lonberg completed his internship and residency in medicine at New York University Hospital Medical Center at Bellevue Hospital in New York. He completed a fellowship in oncology research at NYU, and a fellowship in hematology and oncology at Memorial Sloan-Kettering Cancer Center in New York, where he received awards from the Charles H. Revson Foundation Fellowship in Biomedical Research and the American Cancer Society. Dr. Lonberg is the author of many scientific articles on various oncology and hematology topics.


Aleksandra Mamorska-Dyga, MD, Aleksandra Mamorska-Dyga, MD, is a board-certified internist, medical oncologist, and hematologist. She received her medical degree from the Medical University of Silesia in Poland and completed her internal medicine residency and chief medical residency at Lincoln Medical and Mental Health Center in Bronx, NY (in affiliation with Weill Cornell Medical College). She completed a hematology-oncology fellowship at Westchester Medical Center in Valhalla, NY (in affiliation with New York Medical College). Dr. Dyga was an attending physician at Lincoln Medical and Mental Health Center, Bronx, NY, and at Metropolitan Hospital Center, New York, NY. She was an assistant professor of clinical medicine at New York Medical College Metropolitan Hospital Center. A member of the American Society of Hematology, the American Society of Clinical Oncology, and the American College of Physicians, Dr. Dyga has extensive research and scientific writing experience. She is fluent in Polish.


Robert March, MD,Robert March, MD, is a board-certified internist, medical oncologist and hematologist. Dr. March earned his medical degree from the American University of the Caribbean in Montserrat, British West Indies. He completed his internship and residency in medicine at Bronx VA Medical Center at Mount Sinai Hospital in New York, followed by a fellowship in hematology and medical oncology at New York Medical College of Westchester County Medical Center in Valhalla, NY. Dr. March is an attending physician in Hematology and Medical Oncology at Montefiore Nyack Hospital and Good Samaritan Hospital in Suffern, NY. He is active in biomedical research and has published numerous articles related to his fields of hematology and oncology.


Irina Rybalova, MD,Irina Rybalova, MD, is a board-certified internist, medical oncologist, and hematologist. She earned her medical degree from Russian State Medical University in Moscow and attended an international student exchange program at Harvard Medical School in Boston. After receiving her medical degree, she was a staff physician at Botkin Teaching Hospital of Russian State Medical University. Dr. Rybalova completed an internship and residency in internal medicine at the University of Medicine and Dentistry of New Jersey in Newark, NJ. She completed a fellowship in hematology and medical oncology at Montefiore Medical Center of Albert Einstein College of Medicine in Bronx, NY, and a fellowship in allogeneic bone marrow transplant at Memorial Sloan-Kettering Cancer Center, New York. Dr. Rybalova is dedicated to teaching, accomplished in research, and a published author. She is a volunteer teaching attending at Montefiore Medical Center and an assistant clinical professor at Montefiore Medical Center/Albert Einstein School of Medicine. She is on the Board of Advisors for the Rockland County section of the American Cancer Society.


Jennifer A. Wagner, FNP, BC, AOCNP,Jennifer A. Wagner, FNP, BC, AOCNP, is a board-certified family nurse practitioner by the American Nurses Credentialing Center. She received her certification from the Oncology Nursing Society in Advanced Oncology of Nurse Practitioners and is certified in managing and accessing IV devices and mixing and administering chemotherapy medication. Jennifer received her bachelor’s degree in nursing from Mount Saint Mary College in Newburgh, NY, and completed her Master of Science in Nursing as a family nurse practitioner at Dominican College in Orangeburg, NY. She is a member of the Nurse Practitioner Association of New York State, the Oncology Nursing Society, Sigma Theta Tau International Honor Society of Nursing and Nurses Service Organization.

Carla Laureano Lal, MSN, FNP-C

Carla Laureano, FNP

Radiation Oncologists


Joanne Zhung, MD,Joanne Zhung, MD, is board-certified radiation oncologist at Advanced Radiation Oncology Services at Montefiore Nyack Hospital in Nyack, NY. She attended medical school at UMDNJ-Rutgers, completed her internship at Basset-Columbia Medical Center and her residency at Tufts Medical Center and Loyola University Medical Center.