A Strategic Partnership

Theresa E. Wagler became a member of the Steel Dynamics’ board of directors in August 2026. She has been our Executive Vice President, Chief Financial Officer, and Corporate Secretary since May 2007. Ms. Wagler is responsible for and oversees accounting and taxation, treasury, risk management, legal, cyber security, human resources, decarbonization strategy, and strategic business development functions, as well as financial planning and analysis, investor relations, and corporate communications. She also has various operational responsibilities, directly overseeing several operating joint ventures. Ms. Wagler joined the Steel Dynamics corporate finance team in 1998, and has held various finance and accounting positions, including Chief Accounting Officer and Vice President—Corporate Controller. Prior to joining Steel Dynamics, Ms. Wagler was a certified public accountant with Ernst & Young LLP.

Ms. Wagler graduated cum laude from Taylor University with a bachelor’s degree in accounting and systems analysis. In addition, she serves as a director, a member of the audit committee, and a member of the environmental sustainability and community committee of CF Industries Holdings, Inc., a public company. She also serves as a trustee for Trine University and director for the Metals Service Center Institute.

Jeff Hansen has served as Vice President of Environmental Sustainability at Steel Dynamics, Inc. since January 2021. A visionary leader in industrial decarbonization, Mr. Hansen brings more than 30 years of experience in manufacturing, including 17 years building and developing alternative ironmaking technologies, and has built a reputation for driving transformative change. Mr. Hansen chairs the Global Steel Climate Council (GSCC), where he helped develop the Steel Climate Standard, a global framework for measuring and reporting carbon emissions in steel production.

From 2014 to 2021, Mr. Hansen served as Vice President of Human Resources and Safety, overseeing employee compensation, benefits and medical plans. He also co-founded the Northeast Indiana FAME chapter and was instrumental in developing Steel Dynamics’ company-wide talent development program. He led the development and implementation of safety programs and policies throughout Steel Dynamics, including the company’s Take Control of Safety program.

Mr. Hansen joined Steel Dynamics in 1997 and has held a variety of engineering, supervision, and management functions within the company. He served as the Operations Manager of Mesabi Nugget in Minnesota, leading all aspects of the construction, start-up, and operation of the direct reduced iron technology venture, and played a significant role in the development and operation of Iron Dynamics, Steel Dynamics’ proprietary ironmaking operation in Butler, Indiana. Prior to joining Steel Dynamics, Mr. Hansen held engineering and operational leadership roles at Milliken Chemical, including Pilot Plant Manager, Project Engineer, and Process Engineer.

Mr. Hansen graduated magna cum laude from Rose-Hulman Institute of Technology with a Bachelor of Science in Chemical Engineering and is a registered professional engineer.

Jon Plemons has worked for Steel Dynamics, Inc. since 2003, holding various roles in steelmaking which included melting, casting, rolling and finishing of engineered steels. He also worked on the raw materials side of steelmaking with experience in iron making.

In October 2022, Jon took on his current role with Steel Dynamics, Inc. as the Operations Manager for SDI Biocarbon Solutions LLC in Columbus, Mississippi. This project is a joint venture with Aymium that will convert sustainably sourced biomass into metallurgical carbon to be consumed by the company’s steel production facilities.

Katie Parker has been the Controller of SDI Biocarbon Solutions since she joined the Steel Dynamics team in March 2023. She is responsible for and oversees accounting and taxation, audit and controls, budgeting and forecasting, information technology, payroll and benefits, and other strategic business development functions. Prior to joining SDI Biocarbon Solutions, Mrs. Parker was a Corporate Controller for an electrical manufacturing division of Marmon Group, a Berkshire Hathaway company. She also served as a certified public accountant with Ernst & Young LLP.

Mrs. Parker graduated magna cum laude from The University of Alabama with a Bachelor’s degree in Science and Business Administration with a concentration in Public Accounting. She also has her Master of Accounting degree from The University of Alabama and has been a certified public accountant since 2016. Mrs. Parker also serves as a Wish granter and is on the steering committee for Make-A-Wish Mississippi.

James A. Mennell has over 30 years of experience in the energy, metallics, bio-products, and environmental product sectors, working for or advising major industry participants ranging from start-ups to large public and private companies including Cargill, Koch Industries, POET, 3M, and GE. He has founded, led, and grown bio-based product, energy, and environmental companies from concept through investment and growth to sale or partnerships with publicly traded multinational companies; he has helped develop billions of dollars of capital projects across North America. Mennell’s experience includes serving as President of the bio-based products unit of Cliffs Natural Resources, founding and leading The Environmental Law Group, and investing and serving on the board of directors of biofuels, bio-based products, software, and wind and solar energy companies. Mennell holds over 100 patents regarding bioproduct and process technologies. He graduated as University Scholar (highest honor) from the University of South Dakota and received his Juris Doctor (with honors) and Master’s degrees from Duke University.