The Koch Institute joins the MIT community in mourning Nobel Laureate Susumu Tonegawa, an alumnus of the MIT Center for Cancer Research (our predecessor) and founding director of the Picower Institute for Learning and Memory. Driven by curiosity about fundamental questions in biology, Tonegawa made groundbreaking discoveries in immunology and neuroscience. Awarded the 1987 Nobel Prize in Physiology or Medicine for uncovering the genetic basis of antibody diversity, he later transformed our understanding of how memories are formed, stored, and recalled.