Started the group in 1992. Born in Virginia, USA. Graduated at University of Virginia (1983), M. Sc. from University of California - Los Angeles (1986), Ph.D. from University of California - Los Angeles (1990). Post-doc at Los Alamos National Laboratory. Sabbaticals at Grenoble, Madrid, Karlsruhe, Oxford. Distinguished Professor at the Department of Physics and Astronomy at Iowa State University and Senior Scientist at Ames Laboratory.