“The Well-Covered Vector Space of Graphs”, Canadian Mathematical Society, June 14, 2003.

“A Pedagogical Basis for Online Testing“, 7th Annual Dalhousie Conference on Teaching and Learning, May 7, 2003.

“Don't Have the Tail Wag the Dog - Let the Pedagogy Drive the Technology “, STLHE Conference, Dalhousie University, May 7, 2002.

“A Taste of Chromatic Roots”, 16th Shanks Lecture Series, Vanderbilt University, May 22, 2001.

"Mathematics and Multimedia", OIDT conference, Dalhousie University, May 9, 2000.

“Graphs and Their Polynomials III: The Connection to Commutative Algebra”, Fields Institute, May 3, 2000.

“Graphs and Their Polynomials II: Roots of Graph Polynomials”, Fields Institute, May 2, 2000.

“Graphs and Their Polynomials I: Complexes and Generating Polynomials”, Fields Institute, May 1, 2000.

“The Inducibility of Complete Bipartite Graphs”, Canadian Mathematical Society Meeting, Queens University, December 13, 1998.

“Roots of chromatic polynomials”, Canadian Mathematical Society Meeting, St. John, June 14, 1998.

"Technology Transfer within Mathematics: Commutative Algebra, Symbolic Computation and Combinatorics", AARMS (Atlantic Association for Research in the Mathematical Sciences) Meeting, Dalhousie University, March 24, 1996.

"Algebraic Techniques in Network Reliability", Johns Hopkins University, November 9, 1996, and , University of Toronto, November 13, 1996.

"Complementation of Finite Topologies and Posets", Twenty-Fifth Southeastern International Conference on Combinatorics, Graph Theory and Computing, Florida Atlantic University, March 8, 1994.

"Network Reliability, Combinatorics and Algebra", University of Ottawa, November 9, 1994.

"Mutually Complementary Orders", University of Ottawa, January 8, 1991.

"Problems in and Around Graph Colourings", Graph Theory Workshop, University of Toronto, January 31, 1990.

"Generalized Graph Colourings", University of Waterloo, May 20, 1988.