William Warner Sleator III was born February 13, 1945, in Havre de Grace, Maryland, to William Warner Sleator, Jr., a university professor, and Esther Kaplan, a physician. He grew up in University City, Missouri, near St.

Louis. As a child, Sleator was interested in music, studying the piano and cello for a number of years and writing musical compositions with macabre titles, such as "Guillotines in Springtime" and "The Haunted Easter Egg."

According to Sleator, he was surrounded by scientists as a youth and enjoyed reading science fiction.

In 1967, Sleator received a bachelor's degree from Harvard University and spent the next year in England, where he studied musical composition and worked as a pianist at the Royal Ballet School. He returned to the United States in 1968 and spent the next nine years as a rehearsal pianist for the Boston Ballet. Following that, Sleator took a job...