A graduate of Princeton University and Harvard Law School, Mr. Fishman has spent most of his career as a government lawyer. At the United States attorney’s office in Newark, he worked first for Samuel A. Alito Jr., now a Supreme Court justice, then as the second-in-command to Michael Chertoff, who later was secretary of homeland security. He went on to serve as a top adviser to Jamie S. Gorelick, a deputy attorney general in the Clinton administration.