Guy Nordenson and Associates (GNA) is a structural engineering practice concentrating on collaborative design with architects and clients. The practice was established in 1997 by Guy Nordenson following 20 years in practice in San Francisco and New York, the last 10 as director of Ove Arup & Partners New York, which he established in 1987.

The practice focuses on a number of on-going collaborations with architects. Recently completed projects include the New Museum of Contemporary Art in New York and the Glass Pavilion at the Toledo Museum of Art in Ohio with SANAA and the Nelson-Atkins Museum in Kansas City and the University of Iowa School of Art and Art History with Steven Holl Architects. GNA was also the structural engineer of the Museum of Modern Art Expansion in New York by Taniguchi and Associates with Severud Associates. Current projects include the National Museum of African American History and Culture in Washington DC with Freelon Adjaye Bond/Smith Group and the Kimbell Art Museum Expansion in Fort Worth with Renzo Piano Building Workshop. Beyond museum experience, GNA has established itself as an effective collaborator in the design process of complex and challenging projects, including the World Trade Center Memorial Slurry Wall Bracing Structure in New York with Davis Brody Bond and Simpson Gumpertz & Heger and the design of the 7 Stems Broadcast Tower in New York with Henry N Cobb/Pei Cobb Freed & Partners.