The field of quantum valence fluctuations was another older interest which became much more active during this period, partly as a consequence of my own efforts.

Afterwards he went to Harvard University for undergraduate and graduate work with a wartime stint at the U. Philip Warren Anderson (born December 13 1923) is an American physicist and Nobel laureate. During this period he discovered the concept of localization the idea that extended states can be localized by the presence of disorder in a system; the Anderson Hamiltonian which describes electrons in a transition metal; the "Higgs" mechanism for generating mass in elementary particles; and the pseudospin approach to the BCS theory of superconductivity.

Philip Warren Anderson (born December 13 1923) is an American physicist and Nobel laureate.