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Bristol-Myers Squibb’s Joseph Campisi and Demetrios Kyonieus were virtually inseparable for eight months in 2012 while they negotiated an M&A deal that was large and complex. Because a deal like this was bound to be controversial as well, Campisi, the company’s M&A master, and Kyonieus, BMS’s vice president of strategic alliances and transactions, found themselves joining forces to fend off naysayers, placate accountants, and negotiate with partners—pulling multiple all-nighters along the way. The duo spent so much time together, they became known among colleagues as Batman and Robin. The name stuck, and the dynamic duo even made plans to attend a Halloween party clad in matching tuxedos and Batman masks—until Hurricane Sandy put the kibosh on that.