Abbey Robertson has joined Apostle Management, the management division of Denis Leary and Jim Serpico’s production company Apostle. Robertson, who was a manager at The Collective, joins George Heller in Apostle’s Los Angeles office. Prior to that, she was the co-founder with Melody Hammer of Adept Entertainment, a management and production company. Robertson’s focus will be on creating crossover opportunities for Apostle’s stable of actors, comedians and stand-ups, which includes Robert Kelly, Louis Katz, Nate Bargatze and Erin Foley. “Abbey has a great eye for talent and is well respected in the community,” Serpico said. Apostle’s TV division is posting new IFC series Maron, which will debut May 3, and recently finished half-hour USA pilot Sirens, co-written by Leary.