Gordon J. Freeman, PhD (Damon Runyon Fellow ’79-’81), Dana-Farber Cancer Institute, Boston, is one of five scientists honored by the 2017 Warren Alpert Foundation Prize for discoveries focused on “Immune Checkpoint Blockade and the Transformation of Cancer Therapy.” Collectively, their work has elucidated foundational mechanisms in cancer’s ability to evade immune recognition through the CTLA-4 and PD-1 pathways and, in doing so, has profoundly altered the understanding of disease development and treatment. Their discoveries have led to the development of effective immune therapies for several types of cancer.