William E. Caswell

William Edward Caswell (June 22, 1947 – September 11, 2001) was an American physicist. He did work in quantum gauge theory, most notably, his 1972 calculation of the beta function to two-loop accuracy. His pioneering work in the days of FORTRAN and punch cards demonstrated the potential of computer algebra. Caswell died during the September 11 attacks as a passenger aboard American Airlines Flight 77, which was crashed into the Pentagon. Provided by Wikipedia