His system for organizing correspondence and his "to do" list was described by neuroscientist Daniel J. Levitin, who worked as his executive assistant in the 1980s, in his book The Organized Mind.
Daniel J. Levitin, a neuroscientist who worked as the subject's executive assistant in the 1980s, described the subject's system for managing correspondence and his "to-do" list in his book The Organized Mind.