Dennis Gassner (born October 22, 1948) is an American-Canadian production designer. He is notable for his work on Bugsy, Big Fish, Into the Woods, and Blade Runner 2049, his collaborations with the Coen brothers and Sam Mendes, as well the James Bond films Quantum of Solace, Skyfall, and Spectre, the latter two directed by Mendes. He has been nominated seven times for the Academy Award for Best Production Design and has won once. Gassner was nominated for the Art Directors Guild Award for Excellence in Production Design for a Contemporary Film for his work on Quantum of Solace and won for his work on Skyfall.

Gassner attended the University of Oregon, where he played college football as a defensive end from 1967 to 1969.

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