Harold Fisher Dvorak is an American pathologist and vascular researcher. He is the founding Director of the Center for Vascular Biology Research at the Beth Israel Deaconess Medical Center and the Mallinckrodt Distinguished Professor of Pathology at Harvard Medical School.He received the Canada Gairdner International Award in 2014 for his discovering Vascular Endothelial Growth Factor (VEGF), a key molecular mediator of new blood vessel formation and the development of effective anti-VEGF therapy for cancer and wet macular degeneration.