George E. Kassabaum (December 5, 1920 – August 14, 1982) was an American architect, and one of the co-founders of the HOK architectural firm.

[3] He attended Washington University in St. Louis[4] where he met his future partners, George Hellmuth and Gyo Obata.

[2] Kassabaum graduated in 1947 and began working for a local architecture firm in St. Louis founded by two faculty members of Washington University.

[5] Kassabaum was a board member of Washington University and an Eliot Society president.

[3] Kassabaum died at Barnes Hospital, St. Louis, on August 14, 1982, at the age of 61, having suffered a stroke three days earlier at his home in Ladue, a suburb of St.