Frederick MacDonald "Mac" Quayle, Jr. is an American composer for film, television, and video games. He has worked as the score composer for several TV series, including Sam Esmail productions Mr. Robot and Gaslit; numerous Ryan Murphy productions, such as American Horror Story and its spin-offs American Horror Stories and American Crime Story, 9-1-1 and its spin-offs 9-1-1: Lone Star and 9-1-1: Nashville, Scream Queens, Feud, Pose, The Politician, Ratched, Monster, and The Beauty; as well as the series The Pact and His & Hers. Quayle has also scored additional music for films and video games, and has mixed and produced scores led by other composers. He composed the music for the film Leave the World Behind directed by Esmail.