William M. "Bill" Brown is an American business executive. He became the CEO of 3M on May 1, 2024 and chairman of its board of directors on March 1, 2025. Mr. Brown is also the former chairman of L3Harris Technologies, a large defense contracting company. Previously, he was the president, CEO and chairman of Harris Corporation, the company that merged with L3 Technologies to create L3Harris Technologies in 2019.