William E. Caswell

William E. Caswell
c. 1999
Born	William Edward Caswell (1947-06-22)June 22, 1947 Boston, Massachusetts, U.S.
Died	September 11, 2001(2001-09-11) (aged 54) Arlington, Virginia, U.S.
Alma mater	University of Maryland, College Park (BS) Princeton University (PhD)
Known for	Work in quantum gauge theory
Spouse	Jean
Children	1
Scientific career
Fields	Physics
Institutions	Brown University University of Maryland, College Park Naval Surface Weapons Center
Thesis	Asymptotic Behavior of Non-Abelian Gauge Theories to Two-Loop Order (1975)
Doctoral advisor	Curtis Callan

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.