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Partners: network

Charles Theodore Berger Sr., George Francis Hellmuth, George Edward Kassabaum, Edward King McCagg II, Sandra Mendler, Gyo Obata, William Valentine

Active 1955 - present

This was the successor firm to the Saint Louis, MO-based, Hellmuth, Yamasaki, and Leinweber (1949-1955); Hellmuth, Obata and Kassabaum was also headquartered in Saint Louis; in 1963, the HOK firm operated an office in San Francisco, CA. In 2006, HOK had offices open in the following U.S. cities: Atlanta, Chicago, Dallas, Houston, Los Angeles, Miami, New York, Orlando, Saint Louis, San Francisco, Tampa, and Washington, D.C. It operated offices in London, UK, Toronto, ON, Tokyo, Hong Kong, and Mexico City abroad. In 2011, the firm was known as "HOK Group, Incorporated."

PCAD id: 749