William B. Callaway, FASLA (May 26, 1943 – November 25, 2014) was an American landscape architect with SWA Group, recognized for his ability to design landscapes that are timeless.[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.[1]