'Harvey" is Harvey Drouillard from Ann Arbor, MI. He has a reputation of doing 'flash and dash' nude photo shoots in public places, usually on public sidewalks. His models wear robes, and on his command remove them and proceed to walk around, pretending to be casually walking around in the nude in very public places. He takes the photos and signals the models who then quickly cover up. the whole process takes just a few seconds.
The black and white photos posted by Crispus are from his book.
http://arborwiki.org/index.php/Harvey_Drouillard