Among the first executives asked to join were Kenneth I. Chenault , 53 , chairman and chief executive of American Express , which lost 11 employees in the attack ; Maurice R. Greenberg , 79 , chairman and chief executive of American International Group ; Mr. Parsons ; Peter G. Peterson , 78 , chairman and co-founder of the Blackstone Group ; E. John Rosenwald Jr. , 74 , vice chairman of Bear Stearns ; and Anne M. Tatlock , 65 , chairwoman and chief executive of Fiduciary Trust Company International .