Current: Cinvestav, Campus Queretaro, (1996 to date) PhD in Physics, Department of Physics, Cinvestav, Mexico (1989). M. S. School of Physics and Astronomy University of Minnesota (1984). B.S. School of Physics and Mathematics, National Polytechnic Institute, Mexico (1981). Postdoctoral Fellow, Department of Physics, Simon Fraser University, Canada (1989-1991) Researcher, Department of Physics, Cinvestav (1991-1996)