Stephen Garrett Marcus, M.D. is a physician who has focused his professional career on the development of new treatments for life-threatening and disabling diseases. Born and educated in New York City, Dr. Marcus received his medical degree from New York Medical College. After an internal medicine residency at Lenox Hill Hospital in New York, and oncology (cancer treatment) specialty training at the University of California in San Francisco, Dr. Marcus spent several years practicing emergency and critical care medicine while maintaining clinical activities caring for people with cancer.