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.

Credentials:  CMO , FACP , M.D.
Education & Training
   FACP:    Memorial Sloan Kettering Cancer Center, Long Island Jewish-Hillside Medical Center
   Residency:    North Shore University Hospital
   Medical School:    Yale School of Medicine
   College:    Columbia University


Patient Reviews

  • "I’ve been a patient of Dr. Harry Straszewski for over 26 years. Very knowledgeable hematologist - very caring. Office staff is wonderful."
      from Cecilia 5.0 Stars - (2024-04-12)
  • "Couldn’t ask for a better team! Dr. Harry and his staff are awesome and the Lord is working through their hands! Thank You!!"
      from William 5.0 Stars - (2024-04-10)
  • "Seen by Dr. Harry. Good experience all around."
      from Sundeep 5.0 Stars - (2024-04-06)
  • "The people working there from the receptionist to the ones taking my blood,along with other things was to my satisfaction. My doctor is very efficient in taking care of my needs"
      from Lowell 5.0 Stars - (2024-04-03)
  • "Everyone in the office is very nice and very knowledgeable."
      from Frances 5.0 Stars - (2024-04-03)
  • "I always appreciate their kindness n professionalism of the staff"
      from susan 5.0 Stars - (2024-03-19)
  • "Staff very nice. Dr. Diamond covered everything. He listened to my feelings."
      from Jaye 5.0 Stars - (2024-02-27)
  • "This is by far the most well run office I have ever been too. Dr Harry is awesome!!!"
      from cathy 5.0 Stars - (2024-02-27)
  • "Efficiently run front desk assistants. Doctors are comforting and nurses are exceptional!"
      from Patricia 5.0 Stars - (2024-02-27)
  • "Doctors, nurses, aids and office staff all pleasant, friendly and kind"
      from Filomena 5.0 Stars - (2024-02-27)