Joe Otterson TV ReporterMarc Guggenheim has signed with CAA for representation, Variety has learned exclusively.Guggenheim continues to be represented by attorney Wendy Kirk at Johnson Shapiro Slewett & Kole LLP as well as by manager Cliff Roberts at Syndicate Entertainment.Guggenheim is perhaps best known for his work in The CW’s so-called Arrowverse — its collection of shows based on DC Comics characters. He co-created the first of those shows, “Arrow,” along with Greg Berlanti and Andrew Kreisberg.