Callison, the number one retail design firm in the world (World Architecture, 2003-2008), plans and designs retail, hospitality, mixed-use, residential, corporate and healthcare projects worldwide. With offices in Seattle, New York, Los Angeles, Dallas, Shanghai, London and Mexico City, Callison is one of the largest architectural design firms based in the United States with 800 professional staff. Clients include Nordstrom, Microsoft, AT&T, Harrods, FedEx, Starwood Hotels & Resorts Worldwide, Boeing, HP, Intrawest, Nike, Guess, Franciscan Health System, Seibu Department Stores of Japan, and General Growth Properties.