Bill Hellmuth, AIA, LEED AP, is an American architect who has designed several notable projects worldwide. Since 2005, he has been president of HOK, a global architecture, engineering and planning firm, while also heading its Washington, D.C., office. In April 2016, Hellmuth succeeded Patrick MacLeamy as HOK's CEO while continuing to serve as the firm's president and design principal in Washington, D.C.