When he was twenty-seven, Henry Molaison underwent surgery for his epilepsy. He awoke with part of his brain destroyed, and for the rest of his life would be trapped in the moment, unable to remember anything for more than a few seconds. For nearly five decades, distinguished neuroscientist Suzanne Corkin studied Molaison and oversaw his care. In Permanent Present Tense she tells his extraordinary story, showing how his amnesia revolutionized our understanding of the brain, and also challenged our very notions of who we are.