I received my BSc in Engineering Physics at Colorado School of Mines in Golden (1975), then continued my graduate work at SUNY-Stony Brook, where I received a Ph.D. in physics in 1980. I did post-doctoral research at Princeton University (1980-83), NORDITA in Copenhagen and Helsinki University of Technology (1983-84), then joined the Princeton physics faculty (1983-1987). I served on the Executive Committee of DCMP of the American Physical Society, and I am a long standing member and former officer of the Aspen Center for Physics. In addition to Princeton Unviersity I have held faculty appointments at University of Copenhagen and Joseph Fourier University in Grenoble, as well as research appointments at NORDITA (Denmark) and the CNRS (France). Since 1987 I have been a professor of Physics at Northwestern University in Evanston, Illinois.
I study the physical world by combining mathematical analysis and observation (generally with the help of experimentally inclined colleagues and students). I try to formulate and apply concepts and principles (physical laws) to relate observations of physical phenomena, such as superconductivity, to fundamental properties of matter and radiation. The laws of physics (e.g. quantum mechanics) are expressed in mathematical equations, so in practice I try to formulate physical questions as mathematical problems. I started research in the nuclear theory group at Stony Brook investigating matter under conditions thought to exist in the interiors of cold, dense stars called neutron stars. My current research is in the field of condensed matter physics.