The book "Dangerous Visions" was written by whom?

The book Dangerous Visions is associated with Harlan Ellison, who edited the anthology. Although the question says “written,” Ellison is the canonical answer because he assembled, edited, and introduced the landmark collection.

Published by Doubleday in 1967, Dangerous Visions collected 33 previously unpublished science-fiction stories. Its contributors included major writers such as Isaac Asimov, Philip K. Dick, Ursula K. Le Guin, Robert Silverberg, and Theodore Sturgeon. Ellison’s introductions and editorial choices helped give the volume its provocative identity.

The anthology became an important work of science-fiction’s New Wave, a movement that emphasized literary experimentation, social criticism, sexuality, and psychological complexity. A common mix-up is to treat Dangerous Visions as a conventional novel written entirely by Ellison. It is actually a multi-author short-story anthology, with Ellison serving as editor and contributor of the book’s framing material.