To the world, he was Dr. Sacks, the brilliant neurologist behind bestselling books like Musicophilia and The Man Who Mistook His Wife for a Hat. To professor Susan Barry, he became Dear Oliver-her mentor, friend, and confidant over the course of their ten-year correspondence. It begins with a letter that Sue almost doesn't send. Sue's unheard-of case history-as a "stereoblind" patient who acquired 3D vision in adulthood-so fascinates Dr. Sacks that he immediately asks to visit her. As "Stereo Sue," she becomes the subject of one of his indelible New Yorker pieces-and, as a fellow neuroscientist, his sounding board for every kind of intellectual inquiry. Their shared passions spark a friendship that buoys both of them through life's crests and falls: as Sue becomes an author, as she supports her father in his decline, and as Oliver becomes a patient himself-battling cancer that robs him of his own vision. Dr. Sacks's letters to Sue offer listeners an unprecedented glimpse of the man himself-from his compassion and insight to his love of the periodic table. Throughout Dear Oliver, we are reminded that true friends help each other see the world a little differently.