NEW YORK: Burson-Marsteller global CEO Mark Penn has stepped down from his role at the WPP Group agency. The firm named former Clinton White House communications director Donald Baer to replace him.

Penn, who had led Burson since 2005, will join Microsoft as corporate VP for strategic and special projects.

“I've decided to take on a new challenge in technology and go to a company I've worked with for over 14 years,” Penn said. “I think [Microsoft] is one of the ...