Hellmuth, Obata and Kassabaum

HOK (formerly Hellmuth, Obata + Kassabaum) is a global architecture, interiors, engineering, planning and consulting firm. HOK is the largest U.S.-based architecture-engineering firm and the "No. 1 role model for sustainable and high-performance design." HOK also is the second-largest interior design firm. As of 2011, the firm maintains more than 1,800 professional staff across a global network of 25 offices and is active in all major architectural specialties. Its senior leaders are located in several different locations across the world. HOK was established in St. Louis, Missouri, in 1955. The firm's name is derived from the surnames of its three founding partners: George Hellmuth, Gyo Obata and George Kassabaum, all graduates of the...