HOK, formerly Hellmuth, Obata + Kassabaum, is an American worldwide design, architecture, engineering and urban planning firm. Since its formation in 1955, the firm has designed over 200 structures worldwide. As of 2018, HOK is the largest U.S.-based architecture-engineering firm and the fourth-largest interior design firm. The firm maintains more than 1,700 professional staff across a global …
: https://en.wikipedia.org/wiki/Hellmuth,_Obata_and_Kassabaum

