John Letterio, M.D., is director of the Angie Fowler Adolescent & Young Adult Cancer Institute and division chief of pediatric hematology-oncology at University Hospitals Rainbow Babies & Children’s Hospital and professor of pediatrics at Case Western Reserve University School of Medicine. Letterio has been practicing medicine for nearly three decades, and has received numerous accolades for his contributions to cancer research, including the Jane and Lee Seidman Chair in Pediatric Cancer Innovation.