Marc Guggenheim (born September 24, 1970) 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–present), and Legends of Tomorrow (2016–present), as well as the writer of the feature films Green Lantern (2011), and Percy Jackson: Sea of Monsters (2013). Marc Guggenheim was born and raised to a Jewish family on Long Island, New York. He attended the University at Albany, State University of New York. His brothers are screenwriters Eric Guggenheim and David Guggenheim. After a romantic comedy script led to a few meetings with producers, he moved to California to pursue a career as a screenwriter. A script for The Practice was his first produced work. He eventually served as a producer for Law & Order, Jack and Bobby, CSI: Miami, and In Justice. With Greg Berlanti, Guggenheim is the co-creator of the ABC show Eli Stone. He later became executive producer of ABC's No Ordinary Family. Guggenheim, together with Berlanti and Andrew Kreisberg, adapted the Green Arrow comics into the television series Arrow, where Guggenheim serves as co-showrunner.

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