Howard Lutnick had to rebuild Cantor Fitzgerald after losing nearly 700 people on Sept. 11, 2001, beginning with a search for the passwords only they knew.CreditCredit...Leslye Davis Howard Lutnick, the chief executive of Cantor Fitzgerald, one of the world’s largest financial-services firms, still cries when he talks about it. Not long after the planes struck the twin towers, killing 658 of his c
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