William McClellan “Mac” Thornberry joined Booz Allen’s board in 2024. Previously, Mac represented the 13th district of Texas in the U.S. House of Representatives from 1995 to 2021. Throughout his time in Congress, he was on the Armed Services Committee, serving as chairman from 2015 to 2019 and becoming its ranking member in 2019. Mac also served on the House Intelligence Committee for 14 years and chaired the Cyber Task Force in 2011.
Earlier in his career, Mac served in the State Department during the Reagan Administration, as staff on Capitol Hill, and practiced law in Amarillo, Texas. He currently serves as chair of the board of directors of CAE USA and as a member of the board of directors of Fortinet Federal, Inc.
Mac is a member of the Compensation, Culture, and People Committee and the Nominating and Corporate Governance Committee.
