Derek Richard Grant is an American musician, singer and songwriter best known for being the third and longest-serving drummer for punk rock band Alkaline Trio from 2001 to 2023. He is also a member of Chicago "supergroup" Dead Ending. He was previously a member of The Suicide Machines, Telegraph, Gyga, Thoughts of Ionesco, Remainder, Walls of Jericho, The Exceptions and Broken Spoke. In addition to playing the drums, Grant is a guitarist and vocalist, and has filled in as guitarist for both Face to Face (1998) and The Gaslight Anthem.

Thoughts of Ionesco was a Detroit-based post-hardcore band extant 1996–1999 known for detuned guitars, screamed vocals, complex arrangements, improvisational sections inspired by free jazz, and their destructive live performances.