In the scant days since Harvey Golub retired as chief executive officer of American Express Co., he has gained two new jobs — one of which will have him working closely with a former Amex deputy — and taken a sharp turn away from the cards business.

Mr. Golub, who turned over the managerial reins of American Express to Kenneth I. Chenault on Dec. 31 but who will remain chairman through March, on Wednesday became a senior adviser at the Lazard investment banking firm.

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