WILLIAM H. WEIDEMAN, 70, became Chairman of the Board of Olin on February 16, 2024 after serving as Lead Director since April, 2018. He retired in January 2015 from his position as Chief Financial Officer and Executive Vice President of The Dow Chemical Company (a diversified chemical manufacturing company), a position he held since March 2010. Prior to that, Mr. Weideman served as an Interim Chief Financial Officer from November 2009 to March 2010, and Executive Vice President of Finance, Dow Agrosciences & Corporate Strategic Development from April 2010 to September 2012, all at Dow. He joined Dow in 1976 as a Cost Accountant in Midland, Michigan and held a variety of accounting and controller roles for different Dow businesses.

Mr. Weideman earned a bachelor’s degree in business administration and accounting from Central Michigan University. He served on the board of directors of Mid-Michigan Medical Center and on the Board of Trustees for Central Michigan University through December 31, 2020. From October 30, 2011 until December 31, 2015, he served as a director of Sadara Chemical Company (a joint venture between Saudi Aramco and Dow) and from August 30, 2000 until December 31, 2015, he was a director of the Dow Chemical Employees’ Credit Union.

Olin director since October 2015; Chairman of the Board; Chair of the Executive Committee; member of the Audit Committee. Mr. Weideman brings valuable financial, audit and business administration expertise to Olin’s Board of Directors, as well as extensive knowledge of the businesses Olin acquired from The Dow Chemical Company.