"I'm examining our go-to-market capability" throughout the Euro network, Mr. Heekin said, and after doing that, "we'll decide what to do."
Mr. Hatchuel, 31, said he is planning a new venture more closely related to show business and entertainment than advertising.
"It's an entertainment project I intend to market in a very innovative way," he said. "I've considered it for the past 12 months. I enjoyed myself at Euro RSCG, but as [the project] started taking shape in the last six months, I wanted more and more to do this."
He joined Euro RSCG in February 2002 in the newly created global new-business development role after leaving the Cannes festival, of which his father, Roger Hatchuel, is chairman.
Mr. Hatchuel said he told Bob Schmetterer, Euro RSCG's chairman-CEO and the president and chief operating officer of Havas, several weeks ago that he planned to leave. He said he will spend a couple more weeks at the agency to wrap up two pitches in the U.S. and Europe.
Mr. Hatchuel, who lives in Paris, said he will at least initially remain based in that city.