Mr. Sandbrook serves on the Audit Committee and Nominating and Governance Committee. He has extensive experience in the construction materials industry. He was president and CEO of U.S. Concrete, Inc., from 2011-2020, and also served as chairman of its board of directors from 2018-2020. Prior to that, Mr. Sandbrook served in various roles at Oldcastle Inc.’s Products and Distribution Group, Oldcastle Architectural Products Group, and Oldcastle Materials Inc. In 2019, he was elected chairman of the National Ready-Mixed Concrete Association. Mr. Sandbrook has served as a director of Comfort Systems USA since 2018, where he is a member of the Audit and Compensation committees. He has a master’s degree in business administration from The Wharton School at the University of Pennsylvania, a master of science in systems engineering from the University of Pennsylvania, a master in public policy from the Naval War College, a master of arts in international relations from Salve Regina University, and a bachelor of science from the United States Military Academy.