William A. Bardeen

William A. Bardeen
Born	(1941-09-15) September 15, 1941 (age 82) Washington, Pennsylvania
Nationality	American
Alma mater	Cornell University University of Minnesota
Known for	Chiral anomaly; Quantum Chromodynamics; Top quark condensate; Chiral symmetry breaking.
Scientific career
Institutions	Stony Brook University, Stanford University, Institute for Advanced Study, Fermilab
Doctoral advisor	Stephen Gasiorowicz

William Allan Bardeen (born September 15, 1941, in Washington, Pennsylvania) is an American theoretical physicist who worked at the Fermi National Accelerator Laboratory. He is renowned for his foundational work on the chiral anomaly (the Adler-Bardeen theorem), the Yang-Mills and gravitational anomalies, the development of quantum chromodynamics and the ${\displaystyle \Lambda _{\overline {MS}}}$ scheme frequently used in perturbative analysis of experimentally observable processes such as deep inelastic scattering, high energy collisions and flavor changing processes.

He also played a major role in developing a theory of dynamical breaking of electroweak symmetry via top quark condensates, leading to the first composite Higgs models. His work on the chiral symmetry breaking dynamics of heavy-light quark bound states correctly predicted abnormally long-lived resonances which are chiral symmetry partners of the ground states, such as the ${\displaystyle D_{s}^{*}(2317)}$. He also developed an analytic, non-perturbative approach for the calculation of non-leptonic decays of Kaons, known as Dual QCD.

Bardeen is considered one of the world's leading authorities on quantum field theory in its application to real-world physical phenomena.