(May 19, 2026) Washington, D.C. — The American Cement Association’s (ACA) Board of Directors is pleased to announce that Diane Tomb will assume the role of ACA’s President and Chief Executive Officer, effective June 1, 2026. The Board’s decision follows a thoughtful and thorough search process conducted by its Search Task Group. A seasoned executive with more than 25 years of experience shaping policy, Tomb brings a combination of policy expertise, coalition-building skill, and executive leadership that will serve the cement industry well at this pivotal time.

Tomb joins ACA from ACG Advocacy, where she served as a Partner and advised clients on trade, housing, federal investment, energy, and infrastructure policy. She served as CEO of the American Land Title Association (ALTA), where she elevated the industry’s national voice and forged groundbreaking partnerships with AARP and the FBI to protect consumers from real estate-related fraud. Prior to ALTA, she was President of the National Rental Home Council. Tomb also served as President and CEO of the National Association of Women Business Owners.

Tomb has extensive federal government experience, which includes serving as Assistant Secretary of Public Affairs at the U.S. Department of Housing and Urban Development; Director of Public Affairs at the International Trade Administration at the U.S. Department of Commerce; and in the White House.

“Diane brings strong leadership experience to ACA, a deep expertise in national trade associations, a long history of driving collaboration both within and across industries to create lasting value, with the proven ability to advocate effectively on Capitol Hill,” said Monica Manolas, ACA Board Chair and Region President, Ash Grove East. “She has an impressive track record of raising the profile of other respected trade associations, and I’m certain she will take ACA to the next level as well. I’m happy to welcome Diane to this role at this exciting time in the industry’s history.”

“America’s cement industry is a foundational pillar of our national infrastructure, our manufacturing base, and our national security,” said Tomb. “As innovation and technology reshape how we build from data centers to next-generation infrastructure, domestic cement production is central to America’s economic competitiveness. I am honored to lead ACA at such a consequential moment and could not be more excited to get to work.”

Tomb will work closely with ACA’s outgoing President and CEO, Mike Ireland, to ensure a smooth and coordinated transition. Ireland will remain on staff at ACA until the end of the year.

“The Board is sincerely grateful for Mike’s tenure leading ACA with his significant contributions to the Association and the industry,” Manolas said.

“ACA’s strength has always come from its people, its mission, and its commitment to serving the industry with excellence,” said Ireland. “It has been an honor to lead ACA throughout the past decade, and I am confident that under Diane’s leadership, ACA is well-positioned for continued growth and impact in the years ahead.”

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About the American Cement Association

The American Cement Association (formerly the Portland Cement Association), founded in 1916, is the premier policy, research, education, and market intelligence organization serving America’s cement manufacturers. ACA supports sustainability, innovation, and safety while fostering continuous improvement in cement manufacturing, distribution, infrastructure, and economic growth. For more information, visit www.cement.org.