Mr. Bess will replace CEO Gary Epstein,
An announcement is expected later this week.
A Euro RSCG spokeswoman in Chicago declined comment. Euro RSCG is part of French holding company Havas.
Mr. Bess left WPP Group's Young & Rubicam, New York, last fall as vice chairman for integration and business development; before that was chairman and CEO of the office. A veteran of the Chicago ad world, he was a partner at Bayer Bess & Vanderwarker, now part of Interpublic Group of Cos.' Foote Cone & Belding.