Samuel J. Klempner, MD is a gastrointestinal medical oncologist at the Massachusetts General Hospital Cancer Center and assistant professor at Harvard Medical School in Boston, MA. Dr. Klempner completed his internal medicine training at Brigham and Women’s Hospital/Harvard Medical School followed by a combined hematology-oncology fellowship at Beth Israel Deaconess Medical Center/Harvard Medical School. His clinical and research focus is gastroesophageal cancers and novel therapies. He works in a multidisciplinary team to optimize and individualize treatment using molecular characterization across all stages of stomach and esophageal cancers. Dr. Klempner conducts clinical trials and translational research with new targeted agents and immune therapies. He is active in the stomach cancer community including local outreach, education, and advocacy.