Dr. John Mascarenhas is a Professor of Medicine at the Icahn School of Medicine at Mount Sinai (ISMMS) and a member of the Tisch Cancer Institute in New York City. Dr. Mascarenhas is the Director of the Adult Leukemia Program and Leader of Clinical Research within the Myeloproliferative Disorders Program at Mount Sinai. Dr. Mascarenhas is the Principal Investigator (PI) of the clinical trials project within the National Cancer Institute sponsored Myeloproliferative Neoplasms Research Consortium (MPN-RC). He has served as PI or Study Chair of multiple investigator-initiated and industry-sponsored early and late phase clinical trials evaluating innovative approaches to the treatment of MPNs and secondary leukemia.