Rehr received a Ph.D. in Theoretical Condensed Matter Physics from Cornell University in 1972 working with N. D. Mermin. A NATO postdoctoral fellowship at King's College London (1972-73), and a postdoctoral appointment with 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 K.G. Wilson, at Lund University (spring 1994) with Lars Hedin, and more recently at the Ecole Polytechnique, Paris (Palaiseau) with the group of Lucia Reining. Rehr is currently Professor of Physics Emeritus at the University of Washington and Adjunct Professor of Photon Science at SLAC. Rehr's research specialties are in theoretical condensed matter physics, with major interests in excited state electronic structure and theories 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 360 scientific papers and 40,000 citations (Google Scholar). See also Wikipedia: https://en.wikipedia.org/wiki/John_J._Rehr