Dr. Horng received his BA in Biology, summa cum laude, from Columbia University. He pursued pre-doctoral training in clinical bioethics at the National Institutes of Health then completed his MD-PhD degrees at Harvard Medical School and the Massachusetts Institute of Technology Department of Brain and Cognitive Sciences. His graduate work with Mriganka Sur focused on mechanisms of visual map formation in the developing mouse.  Currently, he is a resident in the Neurology residency at Mount Sinai Medical Center. He has joined the laboratory of Gareth John, where he studies mechanisms of blood brain barrier breakdown in inflammatory brain disease. As a Leon Levy fellow, he will focus on the role of reactive astrocytes in modulating soluble factor and leukocyte entry into the brain.