Dr. Horwitz is an Associate Attending in the Department of Medicine at Memorial Sloan Kettering Cancer Center. There, he divides his time between the clinical care of lymphoma patients and clinical research focused primarily on developing new treatments for T-cell, NK and cutaneous lymphomas. Dr. Horwitz received his medical degree from Case Western Reserve University in Cleveland, Ohio, and continued his training with a residency at the University of Rochester and a fellowship at Stanford University Medical Center. He is on the Board of Directors of the Cutaneous Lymphoma Foundation and the United States Cutaneous Lymphoma Consortium. He is also a member of the executive committee of the International T-cell Registry and the NCCN's Non-Hodgkin's Lymphoma Panel. His efforts have contributed to the approval of several new therapies for T-cell lymphomas as well as new guidelines for PTCL, NK/T-cell and cutaneous lymphomas.