HOK, formerly Hellmuth, Obata + Kassabaum and legally HOK Group, Inc., is an American design, architecture, engineering, and urban planning firm, founded in 1955. Wikipedia
Headquarters: St. Louis, MO
Founded: 1955, St. Louis, MO
CEO: Bill Hellmuth (2016–)
Number of employees: 1,600
President: Carl Galioto
Number of locations: 26 offices
Founders: Gyo Obata, George Kassabaum, and George F. Hellmuth