Professor, Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131, 1998-present

Associate Professor, Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131, 1989-1998

Assistant Professor, Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131, 1983-1989

Post doctoral associate with Dr. John Taylor, Department of Botany, University of California, Berkeley, spring, summer, and fall 1982.