Michael O'Callahan is an architectural photographer based in the San Francisco Bay Area and Silicon Valley.  He has been photographing high-end residential and large corporate projects for 25 years.  Internationally he has photographed projects in France, Germany, Switzerland, Ireland, UK, Singapore, Malaysia, Israel and Mexico. Ranging in size from a tiny Airstream Trailer to the one the world's tallest skyscrapers, the Petronas Twin Towers, Michael has photographed almost every type of structure- hospitals, law offices, federal prisons, residential and corporate interiors, airports, restaurants, clean rooms, universities, internet startups and stadiums.  His images have been published in twenty-five books and dozens of magazine articles, including the cover of Architectural Record.  Michael is also a specialist in HABS/ HAER/ HAL archival photography using a large format camera and black and white film, and his clients include the Presidio Trust and U.C. Berkeley.

Michael O'Callahan and assistant Benjamin Galvez standing next to the Lethal Electrified Perimeter fence inside the maximum security unit of Folsom Prison SAC. The assignment: photographing a prisoner-built Psychiatric Services Unit for Cannon Design Group.

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