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Mario Longhi has stepped down as CEO of U.S. Steel Corp. He will remain on the board and provide transitional support through his retirement at the end of June. David B. Burritt, the company’s president and chief operating office, will assume the position of president and CEO.

"Mario played a key role in driving the company's transformation, including the successful implementation of The Carnegie Way," says David S. Sutherland, chairman of the board. "His impact was felt across our company and the steel industry through his efforts in Washington to combat unfair trade and create a level playing field. We thank him for his dedication to U.S. Steel."

Longhi began his career at U.S. Steel in 2012 as executive vice president and chief operating officer. In 2013, he was promoted to president and CEO and elected to the company's board of directors. Before joining U.S. Steel, Longhi served as president and CEO of Gerdau Ameristeel Corp.

"When I came to the company, I envisioned a five-year tenure, which I have completed," says Longhi. "I am proud of the progress we have made, which solely resides on the people of this company. U.S. Steel employees dug in, tackled every challenge and never stopped looking for ways to improve everything they could control."