Dr. Mark B. Geyer

Jonathan Kolitz, MD, FACP, is Professor of Medicine at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell. An expert in malignant hematology, he is the System Head for Malignant Hematology for the Northwell Health Cancer Institute where he guides the clinical care and research activities of faculty and fellows. Board certified in Internal Medicine, Hematology and Medical Oncology, Dr. Kolitz has been a member of the Leukemia Core Committee of the CALGB/Alliance since 1993. He has focused on the development, conduct and publication of innovative clinical trials for the treatment of hematologic malignancies, especially acute leukemia. He has been principal investigator for numerous novel drug trials and has been involved in multiple national and international collaborations, leading to over 200 publications. As an attending physician at the Monter Cancer Center, Dr. Kolitz focuses on providing compassionate, personalized, evidence-based care. Dr. Kolitz earned his medical degree from the Yale University School of Medicine. He trained in Internal Medicine at North Shore University Hospital and Hematology and Medical Oncology at Memorial Sloan-Kettering Cancer Center. Dr. Kolitz is an active member of the American Society of Hematology, American Society of Clinical Oncology and the American College of Physicians. Dr. Kolitz is rated as an Elite provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). His top areas of expertise are Leukemia, Chronic B-Cell Leukemia (CBCL), Acute Myeloid Leukemia (AML), Chronic Lymphocytic Leukemia (CLL), and Bone Marrow Aspiration.

Theresa Ryan is a Hematologist Oncology specialist and an Oncologist in New York, New York. Dr. Ryan is rated as an Advanced provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). Her top areas of expertise are Pancreatic Cancer, Familial Pancreatic Cancer, Stomach Cancer, Gamma Knife Radiosurgery, and Gastrostomy.

Delong Liu is a Hematologist Oncology specialist and a Hematologist in Valhalla, New York. Dr. Liu is rated as a Distinguished provider by MediFind in the treatment of Acute Lymphoblastic Leukemia (ALL). His top areas of expertise are Acute Myeloblastic Leukemia without Maturation, Acute Myeloid Leukemia (AML), Acute Myeloblastic Leukemia with Maturation, Bone Marrow Aspiration, and Bone Marrow Transplant.