Senior Management

Mr. Gary joined Century in 2010. Mr. Gary was promoted to Executive Vice President and General Counsel in February 2013 and to Chief Operating Officer in April 2019. Mr. Gary was appointed President and Chief Executive Officer July 1, 2021 and was appointed to the Board of Directors, effective as of the same date. Mr. Gary brings valuable leadership, risk-management, and strategy-development experience to the Company and the Board, along with a strong track record of driving growth and innovation and a passion for safety. Mr. Gary also has extensive knowledge of the aluminum industry and global markets and, as the only management representative on our Board, Mr. Gary provides a unique perspective in Board discussions about the business and strategic direction of the Company. The Board benefits from his business insights and knowledge of the Company and the markets it serves. Prior to joining Century, Mr. Gary practiced law at Wachtell, Lipton, Rosen & Katz in New York. Mr. Gary received his B.A. from the University of California at Berkeley and his J.D. from Cornell Law School.

Mr. Trpkovski joined Century in 2013. Mr. Trpkovski was promoted to Director of Financial Planning and Analysis in 2019 and to Vice President, Finance and Investor Relations in 2022. Mr. Trpkovski was promoted to Senior Vice President, Finance and Treasurer during 2023 and to Executive Vice President and Chief Financial Officer in 2025.

Prior to joining Century, Mr. Trpkovski was in the role of Senior Financial Analyst at Citigroup and prior to that he spent six years at Johnson Controls in a variety of roles of Engineering and Finance. Mr. Trpkovski received his BSE (Electrical and Computer Engineering) and MBA from the University of Michigan.

Mr. DeZee joined Century in 2008 as Associate General Counsel. After taking on roles of increasing responsibility, Mr. DeZee was promoted to Executive Vice President, General Counsel and Secretary in May 2021. Mr. DeZee started his legal career at Paul Hastings LLP in Los Angeles and served as in-house counsel at James Hardie Building Products prior to joining Century. Mr. DeZee received his B.A. from Whitman College and his J.D. from the University of California at Berkeley Law School.

Mr. Guðlaugsson joined Century in 2008 and was appointed Plant Manager of Nordural Grundartangi ehf. in 2009 and Vice President, European and Asian Operations and Plant Manager, Nordural Grundartangi in 2017. Mr. Guðlaugsson was appointed Managing Director of Nordural in 2019 and Executive Vice President, Global Operations in 2021. Prior to joining Century, Mr. Guðlaugsson held a number of senior management positions with Rio Tinto Alcan in Straumsvik over a period of more than 10 years. Mr. Guðlaugsson holds a Master of Science degree in Electrical Engineering from the University of Aalborg in Denmark.

Mr. Aboud joined Century in May 2021 as Senior Vice President, Strategy & Business Development. Prior to joining Century, Mr. Aboud spent 18 years with Hydro Aluminum in a variety of roles, including his last role as Vice President – Extrusion Ingot & Wire Rod, where he oversaw both primary and secondary casthouse facilities throughout Europe and Vice President – Primary Metal North America, where he oversaw Hydro’s secondary casthouses and primary aluminum sales in the United States. He was a member of both the Board of Directors from 2016-2019 and the Executive Committee from 2018-2019 for the US Aluminum Association. Mr. Aboud received his B.A. from the University of Virginia and his M.B.A. from Columbia University.

Agust Hafberg has been with Century since 2007 and served in a variety of commercial and business development roles before being promoted to Senior Vice President & Chief Commercial Officer in February 2019. Before joining Century, Mr. Hafberg held several management positions in shipping, logistics and consulting in Europe. Mr. Hafberg holds a degree in Mechanical Engineering and an MBA from University of Iceland.

Mr. Calloway joined Century in 2005 and has served in several roles, including most recently as Vice President of Human Resources. Mr. Calloway is retired from the US Army Reserves where he was as a Drill Instructor and a Combat Advisor during Operation Enduring Freedom (OEF). He received a B.S. degree in Human Resource Management and a Master’s Degree in Business Administration from Bellevue University.

Mr. Hoffman joined Century in October 2004 and was promoted to Corporate Controller in 2013 and Director of Financial Planning and Analysis in May 2015. Mr. Hoffman was promoted to the role of Chief Information Officer in June 2017 and Vice President, Chief Information Officer and Chief Accounting Officer in 2021. In 2024, Mr. Hoffman led the integration effort at the Company’s bauxite mine and alumina refinery in Jamaica while continuing to serve as Chief Information Officer. Mr. Hoffman was promoted to the role of Senior Vice President, Chief Information Officer and Chief Accounting Officer in December 2024. Mr. Hoffman holds a Bachelor of Science degree in Accounting from Golden Gate University, a Master of Business in Finance from Saint Mary’s College of California and is a Certified Public Accountant (inactive).

Mr. Chaffin joined Century Aluminum in 2014 and was promoted to Senior Vice President, Operations, Americas in March 2026. Mr. Chaffin previously served as Vice President, Operations, Americas and Plant Manager of the Sebree facility. Mr. Chaffin also held roles including Director of North American Maintenance and Reliability and Capital Director.

Prior to joining Century, Mr. Chaffin spent nearly 20 years at Alcoa, most recently as U.S. Regional Director of Reliability Excellence and Maintenance and Engineering Manager. He held a range of operational leadership roles across multiple sites. Mr. Chaffin holds a Bachelor of Science in Manufacturing Engineering from the University of Louisville and a Certificate of Management Excellence from Harvard Business School. He is a Certified Maintenance and Reliability Professional, a Project Management Professional (PMP), and a Six Sigma Black Belt.

Ms. Steinsen joined Century in 2011 as an Environmental Specialist and was promoted to HSEQ Manager in 2018 and Vice President of HSE, Sustainability and Management Systems in 2021. Prior to joining Century Ms. Steinsen worked as an engineer at Samskip Iceland. Ms. Steinsen received a B.S and Master’s in Chemical Engineering from The Technical University of Denmark.

Mr. Höskuldsson joined Norðurál in 1999, prior to Century’s acquisition in 2004. Mr. Höskuldsson has served in several managerial roles, including a promotion in 2009 to Director of Rodding and Potrooms. Mr. Höskuldsson was promoted to Vice President, Global Operations in 2021. Mr. Höskuldsson received a B.S. in Electrical Engineering from University of Iceland, a Master’s from The Faculty of Engineering at Lund University, and a Graduate Diploma in Aluminum Smelting Technology from The University of New South Wales.

Ms. Gohmann joined Century in 2022. She was promoted to Vice President, Global Controller in January 2026 after serving as Global Controller, Financial Controller for Norðurál, Assistant Corporate Controller, and Senior Manager of Corporate Accounting. Prior to joining Century, she spent more than seven years at Grant Thornton LLP, where she advanced to Audit Manager. She holds Bachelor’s and Master’s degrees in Accounting from the University of Missouri and is a Certified Public Accountant.