Dr. Shimon Sakaguchi is University Distinguished Professor at Osaka University and a member of the National Academy of Sciences. Dr. Sakaguchi is renowned for his discovery of regulatory T cells (Tregs), which can prevent autoimmunity but can also aid tumor survival and is the world’s authority of Treg biology and function. He was awarded the Medal with Purple Ribbon from the Emperor in 2009, designated as Person of Cultural Merit by the Japanese Government in 2017, and has been awarded many international prizes including Cancer Research Institute’s William B. Coley Award, Keio Medical Science Prize, Canada Gairdner International Award and Crafoord Prize.