I've been photographing and studying photographs since I was an undergraduate in the late 1960's.  For the past 10 years I've taught photo history at Georgetown University, where I am associate dean of the Graduate School.

My favorite subject is the urban landscape.  Among the photographers I most admire are the Evanses (Frederick and Walker), Harry Callahan, Ray Metzker (who attended Beloit College 15 years before I did ), and Frank Gohlke.

My favorite quotation about the nature of photography was not written about photography at all:  

"In its countless alveoli space contains compressed time.  That is what space is for."

The Poetics of Space  by Gaston Bachelard