GCD is an award winning San Francisco Bay Area design firm specializing in custom home renovation, new house construction and sustainable design. Gustave Carlson, principal, has more than two decades of experience in residential and commercial design projects in the Western states and the East coast. Holding a Masters of Architecture from the Graduate School of Design at the University of Pennsylvania, he is an associate with the American Institute of Architects, a member of National Trust for Historic Preservation, a member of Build It Green and the National Association of Remodeler’s Industry.