They include bronze portraits of Nobel Laureates Albert Einstein, Ernest Hemingway, Enrico Fermi, Martin Luther King, and Kofi Annan, and portraits of American Presidents Abraham Lincoln, Franklin D. Roosevelt, Harry S. Truman, John F. Kennedy, Lyndon B. Johnson, Richard M. Nixon, and Ronald Reagan. Other known personalities include TIME Magazine covers of Pope Paul VI, Gen. William Westmoreland, and Johnny Carson as well as sculptures of Mrs. Lyndon B. Johnson, Pablo Casals, Alistair Cooke, George Meany, David Dubinsky, Robert F. Kennedy, Golda Meir, Abba Eban, Mary Lasker, J. Paul Getty, Bob Hope, Frank Sinatra, Jane Fonda, Arnold Schwarzenegger, and many more.

When it is not possible to sculpt from life, Berks’s ability to evoke a sculptured likeness from photographs has led to many well-known works, including posthumous busts of John F. Kennedy, Robert F. Kennedy, and Martin Luther King, as well as to monuments of Justice Louis D. Brandeis for the campus of Brandeis University, John W. Carpenter in Dallas's Southland Plaza, and the monumental head of Erwin Wolfson for the lobby of the Pan Am Building in New York City. When CBS commissioned Berks to sculpt Ernest Hemingway for the signature of a televised Hemingway anthology,the author was following the bullfights in Spain, and the portrait was worked from photos. On the day Pope Paul arrived on his historic visit to the United States, newsstands carried Berks's newly completed portrait of the Pontiff on the
cover of TIME.