Titled Barry, the eight-episode series centres on Bill Hader’s titular character, a seasoned assassin who discovers a passion for acting while on an assignment in Los Angeles.
The series marks Hader’s directorial debut and comes as part of his exclusive development deal with HBO.
Hader has previously worked on the TV series Saturday Night Live, South Park, and Documentary Now!.
Winkler plays Barry’s inspiring teacher Gene Cousineau, while Root stars as Fuches, who arranges Barry’s hits.