John Mack serves as the CEO and Chairman of the Morgan Stanley investment bank.
On September 10, 2009, Mack announced his plans to step down as CEO, but remain Chairman, effective on January 1, 2010. He will be replaced by James Gorman.http://www.marketwatch.com/story/mack-to-pass-morgan-stanley-ceo-position-to-gorman-2009-09-10