Recent Ph.D. Students

• Stewart W. Neufeld, A Diameter Bound on the Exponent of a Primitive Digraph, 1993.

• Kevin N. Vander Meulen, Covers and Decompositions of Graphs by Complete Multipartite Subgraphs, 1995.

• Jian Shen, Exponents of Primitive Digraphs, 1998.   Governor General's Gold Medal, CMS Doctoral Prize

• Valerie L. Watts, Covers and Partitions of Graphs by Complete Bipartite Subgraphs, 2001.

• Sebastian Cioaba , Eigenvalues, Expanders and Gaps between Primes, 2005.

• Randall J. Elzinga , The Minimum Witt Index of a Graph, 2007. [PDF]