Wendell Hill holds the rank of Professor at the University of Maryland, College Park, with appointments in the Institute for Physical Science and Technology and the Department of Physics. He received a B.A. in physics from the University of California, Irvine, in 1974 and a Ph.D. in physics from Stanford University in 1980. He is a guest worker at NIST, where he was a postdoc before joining the faculty of the University of Maryland in 1982, and has held visiting positions with Instituto Venezalano de Investigaciones (Venezuela), Universite de Paris-Sud, Orsay France and JILA. Professor Hill's