Close close-icon

Important Alerts:

Bedford Hills Pediatric office: This office will be closed Friday, August 12. If you need assistance, please call our Mount Kisco Pediatrics office at 914-242-1580.

Update on Monkeypox

CareMount is offering the COVID-19 Vaccination to Babies and Children 6 Months of Age and Older and Booster Dose for Ages 5+, click here to learn more

COVID-19 Guidance and Testing, click here



Jeffrey L. Halaas, MD PhD

Jeffrey L. Halaas, MD PhD

Chair of Department of Oncology

Clinical Assistant Professor, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell


Cancer Care Team

Lymphoma/Leukemia, GI malignancies, Lung cancer, Breast cancer, Gynecological cancers, Head and Neck malignancies, Melanoma & general Oncology and Benign Hematology

Accepting New Patients
New Cancer Patient Appointments: 1-844-484-3292


Carmel/Brewster Campus
185 New York 312
Southeast Executive Park
Brewster, NY 10509-2338

Monday, Tuesday, Thursday

Mount Kisco Campus - 90
90 South Bedford Road
Mount Kisco, NY 10549-3412

Wednesday, Friday

Awards & Recognition

Top Doctor Award – Westchester Magazine: 2013 - 2015

Best Doctor Award - New York Magazine: 2016

Castle Connolly Top Doctor: 2013 - 2015, 2017 - 2021

  • Westchester Magazine: 2013 - 2015, 2017
  • Hudson Valley Magazine: 2017-2021



Undergraduate & Graduate

Stanford University: 1990

Medical Education

MD: Weill Medical College of Cornell University: 1999
PhD: Rockefeller University: 1998


Department of Medicine
New York Presbyterian Hospital: 2000


Department of Medicine
New York Presbyterian Hospital: 2001


Medical Oncology/Hematology
Memorial Sloan Kettering Cancer Center: 2005

Board Certifications

Hematology: 2005, 2015
Medical Oncology: 2005, 2015
Internal Medicine: 2002


Hospital Affiliations

Putnam Hospital Center
Northern Westchester Hospital