Andrew Kreisberg is an American television writer, producer, and comic book writer, best known for his work on various superhero television series within The CW's Arrowverse, including "Arrow," "The Flash," "Supergirl," and "DC's Legends of Tomorrow." Kreisberg started his career in television writing for shows like "The Simpsons," "Justice League," and "Boston Legal." He co-created "Arrow" with Greg Berlanti and Marc Guggenheim, which led to the expansion of the Arrowverse with multiple spin-offs. Despite his success, Kreisberg's career was impacted by allegations of sexual harassment, which led to his suspension and eventually firing by Warner Bros. Television in 2017.