Mr. Rooney will be replaced at Campbell-Mithun, owned by Interpublic Group of Cos., by Steve Wehrenberg, a 25-year veteran of the agency who is currently its chief operating officer.
"Steve has been groomed for this position and we expect that the transition in leadership will be seamless," Mr. Rooney said in a statement. "Our clients and our people are most pleased that our management depth is such that Steve can step right into the CEO position."
Added Mr. Wehrenberg: "I'm energized by the opportunity to lead the agency at which I've spent my entire career, and I look forward to continuing the 75-year tradition of Campbell-Mithun success."
Mr. Rooney joined the agency in 2004 and led it on an ambitious rebranding campaign that concluded early last year. The goal was to get the shop -- named for advertising icon Ray Mithun -- to be seen as less stodgy and more dynamic and creative. The first apparent fruits of that initiative sprouted in September, when the bank bested WPP's Y&R in the final round of a review for Cleveland-based National City Bank's $42 million account.
This will be Mr. Rooney's second swing through Ogilvy. He ran the BP account there from 2000 to 2002.
"The opportunity to return to Ogilvy was irresistible," he said in a statement from Ogilvy.
"Jack is a true 360 agency executive," noted Shelly Lazarus, chairman-CEO of Ogilvy Worldwide. "We're delighted to have him back."
Replaces Garrison at Ogilvy
Mr. Rooney will be replacing Linda Garrison at the helm of the Chicago office. She left the agency in September for a marketing job at Chicago's renowned Steppenwolf theater, best known for its association with the likes of actors John Malkovich and Gary Sinise.
Joe Sciarrotta remains managing director-chief creative officer, presiding over accounts such as Dove soap at Ogilvy, Chicago, which is still recovering from losing its Sears account to sibling Y&R in 2005.