Ph.D. advisee of Professor Harold M. Stark at University of California at San Diego 1979-82
Ph.D. advisor to Jason Price at University of Vermont 2007-2009
Assistant Professor of Mathematics, University of Maine at Orono, 1982-85
Member of the Institute for Advanced Study, Princeton, N.J., Fall 1985
Instructor, The Ohio State University, Winter-Spring 1986
Assistant Professor of Mathematics, University of Vermont, 1986-91
Guest Professor, Department of Computer Science, University of Saarland, Saarbr ̈ucken, Germany, 1992-93
Associate Professor of Mathematics, University of Vermont, 1991-1999
Visitor, Department of Mathematics, University of Texas at Austin, 1999-2000
Professor of Mathematics, University of Vermont, 1999-present
Visitor, Department of Mathematics, University of California at San Diego, 2006-2007
Visitor, Department of Mathematics and Statistics, University of North Carolina at Greensboro, 2015.
Visitor, Department of Mathematics and Statistics, California State University at Chico, 2018