By Mandi Bierly
Updated May 05, 2009 at 01:30 PM EDT

Jared Harris, an actor who’s had recurring roles on Fox’s Fringe (David Robert Jones) and FX’s The Riches (Eamon Quinn), has joined the cast of AMC’s critical darling Mad Men in a similar capacity. According to The Hollywood Reporter, Harris will appear in 10 episodes as the ad agency’s financial officer. The series began filming its third season Monday for an August premiere. Harris, who also appeared in The Curious Case of Benjamin Button, is also currently shooting CBS Films’ untitled medical drama alongside Harrison Ford and Brendan Fraser.