1965-66. Student teaching—General Biology, St. Paul Park H.S., St. Paul Park, MN (December-March).
1966-68. Courses assisted in at CSU—Introductory Zoology, General Invertebrate Zoology, Zoological Techniques, General Parasitology
1970-74. Assistant Professor of Biology, The University of New Mexico, Albuquerque.
1974-79. Associate Professor of Biology, UNM.
1976. Acting Chairman, Department of Biology, The University of New Mexico, Albuquerque (July).
1979—. Professor of Biology, UNM. I teach or have taught the following
courses: Introductory Parasitology, Advanced Parasitic Protozoology, Histological Techniques, Invertebrate Zoology, Marine Invertebrate Zoology, Tropical Biology—Jamaica/Belize,
Parasitology Laboratory Techniques, and various undergraduate and graduate student seminars, honors sections.
1976-77. Senior Research Scientist, Department of Physiology, The University of Texas Medical School, Houston, TX (while on sabbatical leave from UNM) (September-January).
1977. Visiting Associate Professor, Department of Microbiology, The University of Texas Medical Branch, Galveston, Texas (while on sabbatical leave from UNM) (January-June).
1980. Visiting Research Scholar, Kyoto University, Japan (Summer).
1982-91. Chairman, Department of Biology, The University of New Mexico, Albuquerque.
2003- Research Professor, UNM.
2004 Visiting Scientist, International Research Group, University of Kansas (September-October).
2005- Director, Museum of Southwestern Biology, UNM.
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