American Express Co. Chairman and CEO Kenneth I. Chenault

American Express Co. Chairman and CEO Kenneth I. Chenault

Jin Lee/Bloomberg

American Express Co. chairman and chief executive officer Kenneth I. Chenault. AmEx, led by Kenneth I. Chenault, 60, has ramped up its use of social networking and hired executives with backgrounds in technology as the firm girds to compete for online and mobile payments with rivals including Visa Inc. and EBay Inc.’s PayPal.