Gary Brennen


Gary Brennen, Chairman Emeritus, served Syska Hennessy for 41 years in various roles.

Gary holds a BSAE from the Pennsylvania State University and is a licensed professional engineer in Arizona, California, Florida, Kansas, and New York as well as a LEED AP.  In 1982, he joined Syska right out of college and was the firm’s first Certified Carbon Reduction Manager (CRM).

Gary served as co-president from 2007 through spring of 2023. He previously served as as managing director for the western region. He oversaw the firm’s geographic expansion by opening new offices in San Diego and San Francisco. Since then, Gary continues to strengthen the firm’s capabilities in aviation, convention centers, critical facilities, and healthcare. As a member of Syska’s Board of Directors, Gary is responsible for long-term growth and corporate governance of the privately held firm, which was founded in 1928.

Gary has worked with many of the firm’s clients on the most complex and important projects such as the O’Hare Global Terminal, San Diego Airport Terminal 1 Replacement project, United States Courthouse Los Angeles, Long Beach Civic Center, Long Beach Courthouse, Los Angeles International Airport, L.A. LIVE, Phoenix Convention Center, Minneapolis Convention Center, and Orlando International Airport South Terminal.

Outside of Syska, Gary is an active member of the USC Architectural Guild Board, Penn State’s Industry Professionals Advisory Council (IPAC) for the College of Engineering, and American Council of Engineering Companies (ACEC) Risk Management Committee. Over the past several years, Gary has served as a panel judge for the Design-Build Institute of America (DBIA) Western Pacific Region Awards.