When he entered the magnificent Gothic church in early 1992, the former Christopher Crowe had a new name and a meticulously researched persona to go with it. “Hello,” he greeted his fellow worshippers in his perfectly enunciated East Coast prep-school accent, wearing a blue blazer and private-club necktie, which he would usually accent with khaki pants embroidered with tiny ducks, hounds or bumblebees, worn always with Top-Sider boat shoes, without socks. “Clark,” he said, “Clark Rockefeller.”