Question: Patrick MacLeamy is the chairman and former CEO of which American architecture, engineering and planning firm?
Related documents: [0]  [DOC] Patrick MacLeamy, FAIA, LEED AP, (born October 2, 1942, in Alton, Illinois) is an American architect who is chairman and former CEO of HOK, a global architecture, engineering and planning firm. [END] 
[1]  [DOC] HOK, formerly Hellmuth, Obata + Kassabaum, is an American worldwide design, architecture, engineering and urban planning firm. [END] 
Answer: 
HOK
HOK