Steve Demetriou is the executive chair of the board of directors of Amentum. He joined Jacobs Solutions Inc. (Jacobs) as CEO in 2015. In 2016, he became chair and chief executive officer of Jacobs. In January 2023, upon retiring as chief executive officer, he continued as the executive chair of Jacobs board of directors, where he served until the closing of Amentum s merger with Jacobs Critical Mission Solutions and Cyber and Intelligence businesses. During his tenure as CEO, Mr. Demetriou steered a profound reshaping of Jacobs business portfolio, operations and culture. Under his leadership, the company accelerated profitable growth and transformed into a leading, next-generation solutions provider by tackling some of the world s biggest challenges for thriving cities, resilient environments, mission-critical outcomes, operational advancement, scientific discovery, and cutting-edge manufacturing. Mr. Demetriou s broad international business perspectives are the product of more than 35 years in leadership and senior management roles across a wide range of industries. This includes serving as president and CEO of Noveon Inc. (2001 2004) and chairman and CEO of Aleris Corporation (2004 2015). He holds a Bachelor of Science degree in chemical engineering from Tufts University. In addition to serving on Amentum s board, Mr. Demetriou also serves on the boards of FirstEnergy Corp. and Arcosa Inc. Specific qualifications, experience, skills, and expertise include: Public company CEO, Executive Chair, and directorship experience; Core business skills, including financial and strategic planning; and Deep understanding of our Company, its history, and culture.