Mr. Lamb, 34, succeeds Chris Jones, who was recently named co-president of Thompson and is moving next month to New York.

He was named co-president of MySpace along with Michael Jones on February 10, 2010.

In August 2008, Daly was named co-president of the Creative Coalition, a nonpartisan group that works on issues such as health care reform and arts funding.

George S. Rogers was named co-president of the JWT Detroit office, which is responsible for the Ford Motor Company account.

In August 2009 Delany was named co-president of the Creative Coalition, joining Tim Daly in the leadership of the organization.

In 2000, she was named co-president of the Actors Studio, alongside Al Pacino and Harvey Keitel.

During a fleeting unrestricted period in 1985 she was named co-president of the United Democratic Front, the mainstream anti-apartheid organisation inside South Africa.

In May, 2005, he was named chairman of the Altadis board and co-president of the company.

Mr. Dolgen resigned this year after Mr. Freston was named co-president of Viacom.

In 2008 he was named co-president of the board of sponsors of the Bulletin of the Atomic Scientists.