His interests in theoretical physics span condensed matter and optical physics. His groundbreaking work with Patrick Lee on mesoscopic physics and universal conductance fluctuations is one of the most cited works in all of physics from the 1980's and was recognized by the McMillan Award of the University of Illinois at Urbana for “outstanding contributions to condensed matter physics”. For the past decade he has focused much of his research on optics, and specifically on micro cavity optics and laser physics, and holds three patents in these areas. He is a Fellow of the American Physical Society, and a former Trustee and current General Member of the Aspen Center for Physics. He is currently writing a popular book about Einstein's contributions to quantum theory.
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