Our Team
At Mount Sinai South Nassau, we’re focused on the health and well being of you and your family. Committed to healthcare excellence, we’re at the forefront of medical advances that are changing the very foundation of the health care environment. Staffed with dedicated, skilled professionals and the finest technology available, we concentrate on our core value – providing the finest healthcare available to our patients, their families and our communities.
See below to learn more about our compassionate team of expert cancer care professionals:
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Leester Wu, MD
Interim Director of Radiation Oncology and Co-Medical Director of Long Island Gamma Knife
Dr. Wu brings a diverse background in community practice, research, and academic training to Mount Sinai South Nassau’s Radiation Oncology Department. He was the recipient of numerous honors throughout his undergraduate work at Harvard University and while he was in medical school at the University of Pennsylvania. He completed his residency at Columbia University Medical Center in New York, training in state-of-the-art external beam radiation therapy and Gamma Knife stereotactic radiosurgery. Dr. Wu is board certified in radiation oncology. He is fluent in Taiwanese and conversant in Spanish. Contact information: 516-632-3370.
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Michael H. Brisman, MD
Chief, Surgical Neuro-Oncology and Co-Medical Director, Long Island Gamma Knife
Dr. Brisman specializes in the management of malignant and benign brain tumors and is a recognized national expert in the treatment of face pain/trigeminal neuralgia, as well as metastatic brain cancer. Experienced in Gamma Knife radiosurgery, he also performs linear accelerator-based stereotactic radiotherapy. Dr. Brisman is a graduate of Harvard University, completed his medical degree at Columbia University, and a neurosurgical residency at Mt. Sinai Medical Center in New York. He is board certified in neurosurgery.
Contact information: 516-255-9031.
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Joseph Presser, MS, DABR
Director, Radiation Physics and Radiation Safety Officer
Mr. Presser has headed the Physics Team at Mount Sinai South Nassau since 2004. He is responsible for the overall function of the Physics Department as well as the quality assurance programs for two linear accelerators, the Novalis Tx™, CT scanners, and associated treatment planning software. Under his leadership, the Department of Radiation Oncology achieved American College of Radiology Accreditation in 2007. As Radiation Safety Officer, Mr. Presser administers, as well as designed, South Nassau’s radiation safety program and ensures regulatory compliance with New York State Department of Health for maintenance of the Radioactive Materials License. Mr. Presser has served in similar capacities at Virginia Mason Medical Center, NY Hospital-Cornell Medical Center, and Memorial Sloan-Kettering Cancer Center. He is a New York State-licensed Medical Physicist and received his Therapeutic Radiologic Physics Certification in 1998 from The American Board of Radiology.
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Lee R. O'Donnell, BS, LRT (R)(T)
Manager, Radiation Oncology Service
Mr. O'Donnell is the manager of Mount Sinai South Nassau’s radiation oncology department and Long Island Gamma Knife®. He is responsible for the overall operation of the department as well as spearheading the accreditation process with organizations such as the American College of Radiology and The Joint Commission. He is also responsible for deployment of new radiation therapy technologies. Mr. O'Donnell previously served as the Radiation Oncology Manager for North Fork Radiology/Radiation Oncology in Riverhead, NY. Mr. O'Donnell has more than twenty years’ experience in the field of radiology and radiation oncology. He holds a B.S. in Community and Human Services, an A.A.S. in Radiologic Technology Radiation Therapy and an A.A.S. in Radiologic Technology Diagnostic Radiology. He is also a registered technologist by the American Registry of Radiologic Technologists.
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Kathleen Smith Walker, RN
Radiosurgery Nurse, Coordinator, Long Island Gamma Knife
Mount Sinai South Nassau
Department of Radiation Oncology
One Healthy Way
Oceanside, New York 11572
Contact information: 516-632-3366
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Kathy Garizio, RN
Radiosurgery Nurse, Coordinator, Radiation Oncology
Mount Sinai South Nassau
Department of Radiation Oncology
One Healthy Way
Oceanside, New York 11572
Contact information: 516-632-3369 or 516-632-3360
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What to Expect
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Amazing Stories
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Physician Resources
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Patient Resources
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Our Team
At Mount Sinai South Nassau, we’re focused on the health and well being of you and your family...
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