A leader of Katten Muchin Rosenman’s internal investigations practice has joined King & Spalding’s Chicago office, becoming the 24th lawyer to join the Atlanta firm’s two-year-old outpost there.

Karl Heisler, the co-head of Chicago-based Katten’s internal investigations and incident response practice, will work alongside Zachary Fardon, the former U.S. attorney who has been King & Spalding’s point man in Chicago since the firm opened there two years ago. Fardon is the managing partner and head of litigation in the firm’s Chicago office.