Rehr received a Ph.D. in Theoretical Condensed Matter Physics from Cornell University in 1972 working with Prof. N. D. Mermin. A NATO postdoctoral fellowship at King's College London (1972-73), and a postdoctoral appointment with Prof. W. Kohn at University of California, San Diego, (1973-1975) followed. In 1975, Rehr joined the Department of Physics at the University of Washington. Rehr has held visiting appointments at Cornell University (1986-88) working with Prof. K.G. Wilson, at Lund University (spring 1994) with Prof. Lars Hedin, and more recently at the Ecole Polytechnique, Paris (Palaiseau). Rehr is currently Professor of Physics Emeritus at the University of Washington, Adjunct Professor of Photon Science at SLAC, and leader of the Theoretical X-ray Beamline of the European Theoretical Spectroscopy Facility (ETSF). Rehr's research specialties are in condensed matter theory, with major interests in excited state electronic structure and the theory of x-ray and electron spectra. His group is well known for the development of quantitative theories of x-ray spectra, as implemented for example, in the FEFF codes. Rehr's publications include over 340 scientific papers and 26,000 citations to date. See also: Wikipedia: https://en.wikipedia.org/wiki/John_J._Rehr