HGA is a national interdisciplinary design firm rooted in architecture and engineering. Founders Richard Hammel, Curt Green, ... and Bruce Abrahamson established a collaborative, integrated approach to superb modern design. From their first basement office in 1953 the firm has grown to 11 offices from coast to coast: Minneapolis and Rochester, MN; Madison and Milwaukee, WI; Los Angeles, San Francisco, San Jose, and Sacramento, CA; Boston, MA; and Alexandria, VA and Washington, DC. Our over 800 employees form a network of expertise across office and discipline to serve clients from diverse markets. read more