Sarah R. Barenbaum, MD

Weill Cornell Medicine is a leading healthcare institution affiliated with NewYork-Presbyterian Hospital, dedicated to providing exemplary and individualized clinical care, as well as advancing biomedical research and education. The organization prioritizes patient-centered services, offering a range of digital health options, including video visits and second opinions for enhanced convenience and accessibility. With a commitment to compassionate care, Weill Cornell Medicine boasts a robust network of physicians and extensive resources aimed at improving patient health outcomes. The institution is recognized for its excellence, evidenced by its high patient satisfaction scores and comprehensive educational initiatives for both patients and future healthcare professionals. Generated from the website

Caitlin Gribbin, MD, is an Instructor in Medicine within the Division of Hematology and Oncology at Weill Cornell Medical Center. After earning her B.A. from Cornell University, Dr. Gribbin received her Medical Degree as well as Masters in Science from Weill Cornell Medical College. She completed her Internship and Residency as well as subsequent Fellowship training in Hematology and Oncology within the Medical Research Track at Weill Cornell Medicine/NewYork-Presbyterian Hospital. As a faculty member at Weill Cornell, Dr. Gribbin specializes in treating patients with lymphoma using cellular therapies, including chimeric antigen receptor (CAR) T cell therapy. She is simultaneously focused on leading clinical and translational research studies aimed at improving lymphoma treatments by bringing novel scientific discoveries to patients. Dr. Gribbin has co-authored numerous publications and presentations at national and international meetings and has received several research grants, including the American Society of Clinical Oncology (ASCO) Young Investigator Award, the Lymphoma Research Foundation (LRF) Scientific Research Mentoring Program Award, and the Burroughs Wellcome Fund Award.

PROFESSIONAL TRAINING:Research Associate, Department of Nuclear Medicine, University of Vienna, 1998-2000Residency in Internal Medicine, St. Luke’s Hospital Center, New York, 2000-2003Fellowship in Hematology/Oncology, Mt. Sinai Medical Center, New York, 2003-2006Fellowship in Stem Cell Transplantation, Memorial Sloan Kettering Cancer Center, New York, 2007-2008Sebastian Mayer has been an attending physician on the Blood and Marrow Transplantation service at Weill Cornell Medical Center since 2010, after working on the Leukemia Service for two years.A native of Austria, he earned his MD at the University of Vienna with a Doctoral thesis in experimental nuclear medicine. After two years of nuclear medicine research in Vienna, Dr. Mayer completed his Internal Medicine residency at St. Luke’s Roosevelt Hospital center in New York. During that time, he participated in research projects on the molecular biology of lymphoma at Mount Sinai Medical Center and Albert Einstein College of Medicine.After a fellowship in Hematology/Oncology and a subsequent faculty appointment at Mount Sinai Medical Center, he completed a fellowship in Stem Cell Transplantation at Memorial Sloan Kettering Cancer Center.His main research interests lie in the reversal of chemotherapy resistance in leukemia before stem cell transplant, specifically for patients with a high risk of disease recurrence. He also is an active investigator in the treatment of graft versus host disease, a feared complication of stem cell transplant, as well as the prevention and management of transplant rejection.Dr. Mayer greatly enjoys the close interaction with his patients and also takes an active role in the education of junior physicians and medical students.