Citigroup Stock Shows Investors Applaud CEO Change, Mack Says

Citigroup Stock Shows Investors Applaud CEO Change, Mack Says

Peter Foley/Bloomberg

John Mack, who joined private-equity firm KKR & Co. as a senior adviser in March, stepped down as chairman of Morgan Stanley at the end of last year, two years after ceding the CEO role he held at the Wall Street bank from 2005 to 2010 to James Gorman.