Raymond Y. Chiao is Professor of Physics in the Schools of Natural Sciences and Engineering at the University of California, Merced, where he is pursuing a new line of groundbreaking research on gravitational radiation. Marvin L. Cohen is University Professor of Physics at the University of California, Berkeley, and Senior Faculty Scientist in the Materials Sciences Division of the Lawrence Berkeley National Laboratory. His principal research interests lie in theoretical condensed matter physics. Among his numerous awards and honors, Professor Cohen received the 2001 National Medal of Science. Anthony J. Leggett is the John D. and Catherine T. MacArthur Professor of Physics and the Center for Advanced Study Professor of Physics at the University of Illinois at Urbana-Champaign. His principal research interests lie in condensed matter physics and the foundations of quantum mechanics. Among his numerous awards and honors, Professor Leggett shared the 2003 Nobel Prize in Physics. William D. Phillips is a physicist at the Joint Quantum Institute, a cooperative venture of the National Institute of Standards and Technology (NIST) and the University of Maryland. He is the Leader of NIST's Laser Cooling and Trapping Group in the Atomic Physics Division. Among his numerous awards and honors, Professor Phillips shared the 1997 Nobel Prize in Physics. Charles L. Harper, Jr. is the former Senior Vice President of the John Templeton Foundation in Philadelphia. He is currently President of Vision-Five, a philanthropic consulting firm, also in Philadelphia.