His works have been exhibited widely and are held in many major public collections of photography. His most recent project is an ongoing study of the architecture of Le Corbusier. He was the founding curator of the photography collection of the Canadian Centre for Architecture at its inception, in 1974, and has been a consultant to the collection since 1989. Among his exhibitions and publications are Court House: A Photographic Document (1978), Photography and Architecture: 1839–1939 (1982), Tadao Ando: The Colours of Light (1996), and The Lost Vanguard: Russian Modernist Architecture, 1922–32 (2007).