Much of his work is undertaken without the aid of a camera, aperture, or film, being instead produced through a combination of photogrammic, abrasive, and incisive techniques.
[1] Breuer works in and outside of the darkroom, exposing photographic material to heat, light, and physical abrasion.
Drawing implements have included 12-gauge shotguns, the guts of electric frying pans, modified turntables, razor blades, and power sanders.
Breuer's photographic techniques include recent works on chromogenic paper to early black-and-white photograms, gum bichromate prints, silkscreens, artist books,[2] and unlimited newsprint editions.
One-person museum exhibitions include Line of Sight at the de Young Museum in San Francisco (2011), New Pictures 2: Marco Breuer at the Minneapolis Institute of Arts (2010), and Circa 1999 at the MIT List Visual Arts Center in Cambridge, Massachusetts (2001).