William Warner Sleator III (February 13, 1945 – August 3, 2011)[1], known as William Sleator, was an American science fiction author who wrote primarily young adult novels but also wrote for younger readers. His books typically deal with adolescents coming across a peculiar phenomenon related to an element of theoretical science, then trying to deal with the situation. The theme of family relationships, especially between siblings, is frequently intertwined with the science fiction plotline.

Due to the suspenseful and often eerie nature of some of his works, Sleator has been compared to young-adult horror writer R. L. Stine. Others cite a strong resemblance to the paranoid, dream-like style of Franz Kafka, which is most notable in House of Stairs, one of Sleator's more popular novels.

One by one, five sixteen-year-old orphans are brought to a strange building. It is not a prison, not a hospital; it has no walls, no ceiling, no floor. Nothing but endless flights of stairs leading nowhere aexcept back to a strange red machine. The five must learn to love the machine and let it rule their lives. But will they let it kill their souls? This chilling, suspenseful indictment of mind control is a classic of science fiction and will haunt readers long after the last page is turned. aAn intensely suspenseful page-turner.a aSchool Library Journal aA riveting suspense novel with an anti-behaviorist message that works . . . because it emerges only slowly from the chilling events.a aKirkus Reviews