Marc Guggenheim is an American screenwriter, television producer, comic book writer, and novelist. He is best known as the creator of the television series Eli Stone (2008–2009), Arrow (2012–2020), and Legends of Tomorrow (2016–2022), executive producer of the animated series Tales of Arcadia (2016–2021), as well as the writer of the feature films Green Lantern (2011) and Percy Jackson: Sea of Monsters (2013).

Eli Stone is an American legal musical comedy-drama television series that was created by Greg Berlanti and Marc Guggenheim, who also served as executive producers alongside Ken Olin who directed the pilot, with Melissa Berman producing. The series originally aired on ABC from January 31, 2008 to July 11, 2009, for two seasons.