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The CEO of advertising giant FCB Worldwide tells how his company bounced back after a huge client defected. Learn why he salutes smart memos and a stringent no-jerks policy. His lanky frame tensing, his dark eyebrows twitching, he says that it's hard to remember a worse day in his professional life. You have no idea how upsetting this was. On that day in November, Ryan, the CEO of ad agency FCB Worldwide, got the news that the company's marquee account, DaimlerChrysler, was being taken over by rival agency BBDO Worldwide, a unit of Omnicom Group.