Medical Oncology & Hematology
Dr. Staszewski served as Chief of the Oncology Hematology Division at Winthrop-University Hospital from 1996-2015, and is an Associate Professor of Clinical Medicine at SUNY Stony Brook.
After earning an M.D. from Yale University, Dr. Staszewski completed his residency training and fellowships at North Shore University Hospital, Long Island Jewish Medical Center and Memorial Sloan Kettering Cancer Center. Dr. Staszewski maintains active memberships with the American Society of Clinical Oncology, American Society of Hematology, and the American Association for Cancer Research. He has been recognized as an outstanding hematologist by his listing numerous times in the annual “Best Doctors” issue of New York Magazine. Dr. Staszewski was the principal investigator for a number of clinical trials in breast cancer, leukemia, myeloma, and colorectal cancers. He fosters innovation and research, particularly in cutting edge molecular diagnostic technology, helping to bring personalized medicine and bio-marker research from theory to reality.
He has published numerous articles in major peer-reviewed medical journals. During his 30+ year career in Medicine, Dr. Staszewski continues to develop and maintain the ongoing medical education of physicians and clinical staff. Dr. Staszewski has been closely involved in mentoring and teaching medical students, residents and sub-specialty fellows.
Dr. Staszewski’s clinical practice spans the entire spectrum of hematological and oncological disorders but he has a particular interest in hematological malignancies and colorectal cancer. At New York Cancer & Blood Specialists, Dr. Staszewski currently serves as Chief Medical Officer.
| John T Mather Memorial Hospital |
| Peconic Bay Medical Center |
| St. Catherine Of Siena Medical Center |
| St. Charles Hospital |
Patient Reviews
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"Everyone from reception to Dr. Harry and the nurses met or exceeded my expectations."
from leonard 5.0 Stars - (2025-11-29) -
"Excellent and caring doctor and staff. Was in and out in 1 hour."
from John 5.0 Stars - (2025-11-21) -
"Staff was very caring and professional."
from Michael 5.0 Stars - (2025-11-09) -
"I was highly recommended to Dr. HARRY, and the recommendation was as advertised. The experience was excellent."
from Gus 5.0 Stars - (2025-10-31) -
"⭐️⭐️⭐️⭐️⭐️
Everyone was so kind, friendly, and caring from start to finish. Dr. Staszewski truly listens, explains everything — including the next steps — and you can tell he really cares. The whole staff was amazing and made me feel completely comfortable. I’m so grateful I was sent here!"
from Melissa 5.0 Stars - (2025-10-26) -
"Harry was very informative and let me know what I needed to do great doctor"
from Richard 5.0 Stars - (2025-10-22) -
"He’s the best!!!"
from mel 5.0 Stars - (2025-09-30) -
"My husband and I both see Dr. Harry, he is a true professional in everything. I find him to be very understanding and kind. His staff is so gentle with my lousy veins, you get real TLC when they take care of you. Grateful."
from Trudi 5.0 Stars - (2025-09-30) -
"Dr. Harry is a great doctor anda wonderful human being. He is empathic amd brilliant and listens. He encompasses all the qualities a great divot should."
from Ellen 5.0 Stars - (2025-09-16) -
"(Translated by Google) Excellent service, it is not a long wait and they are very friendly.
(Original)
Exelente atención, no es espera larga y son muy amables"
from Deysi 5.0 Stars - (2025-09-09)