He created hundreds of bronze sculptures and monuments including the Mary McLeod Bethune Memorial, and the Albert Einstein Memorial in Washington, D.C. Bob was prolific and created numerous sketches, drawings, and paintings; often in service of sculpture and site-planning subjects.

He worked for over 50 years in a converted schoolhouse on the north fork of Long Island, NY.

For projects with living subjects, Bob would often invite individuals to visit with he and Tod for a period of a week or two so he could observe them in real life; through this time he captured emotions, tendencies, facial expressions, and body language.

It was this commitment to understanding his subject below the surface that facilitated the intimacy and personality found in his sculptural portraits.

Depending on the desires of the sitting US President, Berks' busts of famed civil servants and civil rights leaders line the walls of the Oval (Eight (8) original works are owned by the National Gallery); most often on view are busts of FDR, Lincoln, RFK, Ronald Reagan, and JFK.