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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"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) -
"I wanted to share some feedback about my recent visit. Before Doctor Harry came in, I was speaking with a staff member who interrupted me several times and seemed to rush through my responses, which left me feeling unheard and somewhat judged. While taking my heart rate, she asked if I was nervous. I mentioned feeling anxious about having my blood drawn, and she laughed, which made me feel even more uncomfortable. What pushed it over the edge was when she started asking if I “do drugs,” then rattled off a list “do you do coke? heroin?” rapid fire, without any care for how accusatory or inappropriate it sounded. I had already said no. I honestly felt cornered. It was degrading. For a $50 co pay, I expected to be treated like a human being, not like a nuisance or a suspect. It came across as lacking empathy, and I believe it’s important in this field to evaluate patients based on their symptoms, not assumptions or appearances. Every patient deserves to feel listened to and respected. In the future, if this staff member is present, I would prefer to wait to speak directly with the doctor he is great."
from Eva 4.0 Stars - (2025-07-25) -
"Denise at the front desk was so friendly, professional and helpful. She greeted me as soon as I came in the door, very welcoming staff.
Emily, the MA and Nicole, the PA were also very professional and friendly"
from joann 5.0 Stars - (2025-06-28) -
"Always professional n pleasant"
from susan 5.0 Stars - (2025-06-17) -
"Excellent doctor! Staff and customer service all are fantastic and focused on their work with very friendly demeanor! I would recommend it to all my family and friends."
from Saeed 5.0 Stars - (2025-05-30) -
"Wonderful doctor and staff....very good experience for my situation...felt very comfortable"
from Donna 5.0 Stars - (2025-04-30) -
"Dr Harry is the man!! He is a doctor who listens and doesn't make you feel like you're asking dumb questions, which is hard to come by now a days. He's compassionate, caring and has a great sense of humor when times are tough. Absolutely adore him."
from Tara 5.0 Stars - (2025-04-17)