Michael Ausiello
April 13, 2010 AT 09:02 PM EDT

Image Credit: Carin Baer/AMCConsidering the new agency is called Sterling Cooper Draper Pryce, this was inevitable: Mad Men is elevating Jared Harris to a full-fledged series regular in season 4, sources confirm to me exclusively.

Harris joined the Emmy-winning drama in season 3 as Lane Pryce, Sterling Cooper’s new financial officer (installed by UK parent company Putnam, Powell, and Low). In the finale, he became a founding partner in SCDP alongside Don Draper, Bert Cooper, and Roger Sterling.

Related: Mad Men casting three new roles!

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