After completing pediatric residency training at Childrens Hospital Los Angeles, an Infectious Diseases Fellowship immediately followed at the University of Washington in Seattle, Washington. In 2004, he received the Fellowship Award from the Pediatric Infectious Diseases Society.As a fellow, Dr. Han studied modulation of cytotoxic T-lymphocyte function by herpes simplex virus and characterized the mechanism behind inhibition of cytotoxic T-lymphocyte function. His current research focuses on understanding the mechanism behind induction of T cell apoptosis by herpes simplex virus.Dr. Han has professional memberships in both the Pediatric Infectious Diseases Society and Infectious Diseases Society of America.