William G. Malley, an environmental lawyer based in Washington, D.C., became the new firmwide managing partner of Perkins Coie on Monday.In an interview with the Daily Law Bulletin, he said the firm’s goal of expansion will proceed. Malley succeeds John Devaney, who became firmwide managing partner in 2014.“We intend to continue that emphasis on growing offices in major markets, including Chicago, Washington, D.C …