More than 360 law firms gained the Mansfield Certification for 2023-24 for pushing for leadership diversity, up 13% from the 320 firms that were certified the previous year, the organization said Wednesday. New in 2023-24 to the program were 45 firms, including firms such as Cadwalader, Wickersham & Taft, Goodwin Procter (in the U.K.), and Withersworldwide (in the U.S. and the U.K.).