Jagdish Mehra has been University Distinguished Professor of Sciences and Humanities at the University of Houston, Texas for many years and also served as UNESCO-Sir Julian Huxley Distinguished Professor of Physics and The History of Science at Trieste and Paris. He has published extensively on the
historical and conceptual development of modern physics and is the acclaimed biographer of 'The Beat of a Different Drum: The Life and Science of Richard Feynman'. From Spring 1959 until Schwinger's death, Mehra remained his close friend. Kimball A. Milton is Professor of Physics at the University
of Oklahoma, where he leads the theoretical high-energy physics group. He has numerous publications in the field of quantum field theory. He was a student of Julian Schwinger at Harvard and was his postdoctorate associate at UCLA for nearly a decade.