© AIP Emilio Segrè Visual Archives, Physics Today Collection.
Fritz London was a seminal figure in the early days of quantum mechanics through his pioneering work on the chemical bond with Walter Heitler and his work with Edmond Bauer on the measurement problem. He was also the insufficiently celebrated heroic contributor to our understanding of superfluidity and superconductivity. As P. W. Anderson has emphasized, in his essay on London, "He was among the few pioneers who deliberately chose, once atoms and molecules were understood, not to focus his research on further subdividing the atom into its ultimate constituents, but on exploring how quantum theory could work, and be observed, on the macroscopic scale." (Unit: 8)