Jacqueline Kennedy Onassis was First Lady of the United States from 1961 to 1963 and, after the assassinations of her husband and brother-in-law, a longtime book editor in New York. In the mid-1960s she wrote a statement for a traveling Kennedy Library exhibit summarizing her late husband’s convictions — the passage from which this widely misattributed ‘one person can make a difference’ quote descends.