[1] Peter Walker, designer of the World Trade Center Memorial and a long-time colleague, described Callaway as being "among the icons of post-World War II practice", developing his modern style by consistently staying true to the natural character of the landscape.
"Closer to home, Callaway has designed the corporate campus for Electronics Arts in Redwood City, the master plan for Mare Island (Solano County) and Shoreline Regional park in Mountain View.
"[1] Other noted U.S. work includes Concord Pavilion and Refugio Valley Park in California, PPG Place in Pittsburgh, and Arizona Center in Phoenix.
In bestowing the 2007 ASLA Medal, the organization's highest honor for an individual, the jury said his "personal leadership, charisma, and professional passion inspire designers to retain an idealistic view of the profession and the world.
In 1969, he left Sasaki Walker to attend Harvard University's Graduate School of Design, where he received his Master of Landscape Architecture in 1971.