• 2016Present: William R. Kenan, Jr. Professor, Department of Physics and Astronomy,
Johns Hopkins University. • 20112015: Professor of physics and astronomy, Johns Hopkins University. • 2010 Fall:
Miller Visiting Research Professor, Department of Physics,
University of California, Berkeley. • 20062012: Robinson Professor of Theoretical Physics and Astrophysics,
California Institute of Technology. • 20062011: Founding director, Moore Center for Theoretical Cosmology and Physics, California Institute of Technology. • 19962007: Professor of theoretical physics and astrophysics, California Institute of Technology • 19981999: Associate professor, Department of Physics,
Columbia University. • 19941998: Assistant professor, Department of Physics, Columbia University. ==Awards and fellowships==