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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"Great to have a doctor so experienced be so easy to talk to."
from Murray 5.0 Stars - (2025-08-29) -
"I had to get blood work from another doctor and they kindly did it there which I thought was super great so I didn't have to wait a couple days to have it done at a lab. They are very professional there also they're very helpful if you have any questions"
from Betsy 5.0 Stars - (2025-08-23) -
"The staff was very friendly and caring! Cared about your concerns and how you felt!"
from Johnny 5.0 Stars - (2025-08-22) -
"I'm not an easy stick and yesterday they got me on the second try which was wonderful for me the doctors there are so nice and the girls that draw the blood and guys always try their best not to hurt me"
from Margaret 5.0 Stars - (2025-08-19) -
"Not that anyone wants to go to a place called the blood and cancer center however the staff and the atmosphere were exceptional in making you feel comfortable"
from Lisa 5.0 Stars - (2025-08-16) -
"The Doctor was excellent and so was the staff."
from Glenn 5.0 Stars - (2025-08-15) -
"I could not be happier or more satisfied with all of the staff and Dr Harry. They are kind, compassionate and extremely efficient. I never feel as if I am being rushed They listen to me and answer my questions. I never leave the office feeling unsure that I am receiving the best of care."
from Jamie 5.0 Stars - (2025-08-12) -
"A much more positive atmosphere than the 112 office."
from Richard 5.0 Stars - (2025-08-05) -
"Very friendly atmosphere"
from james 5.0 Stars - (2025-08-02) -
"Have consistently had a great experience at NY Cancer and Blood specialists. Everyone is always courteous and friendly and the care has been great. Dr Guo and her team are outstanding"
from Harry 5.0 Stars - (2025-07-29)