Dr. Weiser is an attending colorectal surgeon at Memorial Sloan Kettering Cancer Center and holds the Stuart H. Q. Quan Chair in Colorectal Surgery. His clinical focus spans the full spectrum of large‑bowel malignancies, where he combines expertise in laparoscopic, robotic and nerve‑sparing approaches with an unwavering commitment to functional preservation. Patients under his care receive individualized surgical plans that integrate high‑definition imaging, precision staging tools and careful consideration of quality‑of‑life goals.
An active investigator, Dr. Weiser leads translational research that refines prognostic models and explores circulating tumor DNA as a guide for tailored therapy. He is the surgical lead for the PROSPECT trial, an international study designed to personalize rectal‑cancer treatment while reducing treatment‑related toxicity. His scholarly output of peer‑reviewed articles, textbook chapters and invited lectures underscores a dedication to moving discoveries swiftly from laboratory concepts into operative reality.
Beyond technical mastery, he fosters a collaborative environment where surgeons, medical oncologists, radiation specialists and genetic counselors meet regularly to discuss each case. This team ethos, coupled with a compassionate communication style, provides patients and families with clear guidance through complex decisions. As Vice Chair for Faculty Affairs in the Department of Surgery, he also mentors the next generation of cancer surgeons, emphasizing data‑driven practice and continuous improvement.
Locations:
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Insurance
Insurance changes all the time, so please call and confirm if your insurance is accepted.
- AetnaAetna Medicare Advantage (MTA and NYC retirees only)Anthem BCBS and other BCBS licensee plansAnthem BCBS Health PlusBlue Cross Blue Shield Federal Employee ProgramBlue Cross Blue Shield states outside of NY/NJCarrum HealthCignaConnectiCareEmblemEmblem EssentialEmblem Medicare Advantage (Medicare Choice PPO Network and VIP Prime Network Only)Empire EssentialEmpire Plan / NYSHIP (Blue Cross/UnitedHealthcare split plan)FidelisFidelis Medicare AdvantageFidelis Managed Medicaid & HARPFirst HealthHealthfirstHealthfirst Medicare AdvantageHealthSmartHorizon Blue Cross Blue Shield New Jersey (HMO)Horizon Blue Cross Blue Shield New Jersey (PPO)Horizon Blue Cross Blue Shield New Jersey Omnia Tier I (EPO)Horizon Blue Cross Blue Shield New Jersey Omnia Tier II (EPO)Horizon Medicare AdvantageHusky CT MedicaidMagnaCareManaged MedicaidMetroPlusMVPNYC Medicare Advantage Plus for City EmployeesNon-Participating Plans with Out of Network BenefitsOscarQualCareStraight NJ MedicaidStraight NY MedicaidTricareUMRUnitedHealthcareWorld Trade Center Health Program (WTC)