It was a Friday in the fall of 2004 and Umber Ahmad had been invited to read a poem at the wedding of one of her closest friends. She was planning to catch a 7 p.m. flight from New York to Toronto when a vice president at Morgan Stanley called her in. The client in a big merger deal needed work done over the weekend. A mergers and acquisitions specialist, Ahmad had no choice. She canceled the flight and started revising her analysis of the deal, Bloomberg Markets magazine will report in its June issue.