Behrens was born in Chicago, Illinois, in 1933. He grew up near Washington, D.C. He began drawing at age seventeen after being confined to bed following a sledding accident. His formal education in art was at the University of Maryland, College Park, where he earned a master's degree in painting and sculpture. Behrens was hired by the United States Government Printing Office, where his father was employed as a printer, and worked there for the next seventeen years. Behrens resided in Potomac, Maryland, and died on April 14, 2014, after a long battle with Parkinson's disease.
Behren's style developed over time, and he spoke of painting becoming its own subject matter: "I slowly started using the palette knife to paint on canvas," said Behrens. "It started out very fine and thin using very little paint. Then, it got thicker and thicker and heavier and heavier. Finally, the most amazing thing happened - the act of painting became the subject matter." Behrens also developed a method for creation that combined travel, sketching, fine art photography and painting. Creation of paintings that integrate what he calls "big, juicy chunks of paint."