Selected Presentations:

1. ``Fully Fuzzy Topology'', Linz99, February 1999
2. ``What does Finite mean?'', Natural Science Seminar, November 1998
3. ``Using a lab in a Linear Algebra Course front-loaded with concepts'' ISMAA meeting, Rockford, March 1997
4. ''A modeling course based on a mock consulting firm'' Regional meeting of the AMS, Chicago, March 1995
5. ``Generalizing Categorical Logic-What can be gained?'' Sring Meeting of the Association for Symbolic Logic, Kansas City, May 1994
6. ``A categorical setting for second order mathematical structures,'' Joint meetings of the AMS, Baltimore, January 1992
7. ``Topos-like categories'' Bergische Universität Gesamthochschule Wuppertal, September 1991
8. ``A Writing Assignment on the Definition of a Limit,'' MAA session on writing in the mathematics curriculum, Atlanta, January 1988
9. ``Fuzzy Set and Topos Theory,'' Second Congress of IFSA, Tokyo, July, 1987 (invited hour address)
10. ``Sneaky Ways to Count,'' Peoria Area Teachers Institute, 1983
11. ``What is Topos Theory?'' Illinois Section MAA, 1979 (invited hour address)