Elizabeth Clements

Bill Bardeen Photo: Reidar Hahn From quantum chromodynamics to family genealogy, Bill Bardeen loves to solve puzzles. As a theoretical physicist, his approach to solving physics problems about the fundamental nature of matter made him a world-leading expert on quantum field theory. In his spare time, as a genealogist, the same persistence resulted in tracing the Bardeen family line back to Massachusetts in 1717. In December, after 35 years of tackling theoretical physics problems at Fermilab, Bardeen retired. There is…