Chairman of the board of directors of Gilbane, Inc., one of the nation's largest real estate and construction firms, since 2025, and a director since 2023. Served as Chairman from 1999 to 2021 and President and Chief Executive Officer from 1999 to 2018, of The Haskell Company, one of the largest design-build and engineering and construction firms in the U.S. Served as Senior Vice President of M.A. Mortenson, a national construction firm. Served as a director from 2014 to 2025 of GuideWell Mutual Holding Corporation, a not-for-profit company that is the parent to a family of companies focused on advancing health care, including health insurance group Blue Cross and Blue Shield of Florida, for which Mr. Halverson also served as a director from 2010 to 2025. Mr. Halverson has served as the chair of professional and business organizations such as the Construction Industry Roundtable, the Design-Build Institute of America, and the National Center for Construction Education and Research. He has also served as the chair of several civic organizations, including the Florida Council of 100, the Florida Chamber of Commerce, and the Jacksonville Civic Council. He is a certified fellow of the National Association of Corporate Directors and received certification in ESG Governance from Berkley Law School.