Grinnell College, Lecturer in Computer Science and Philosophy, 1989-
Grinnell College, Manager of the Mathematics Local-Area Network, 1989-
Grinnell College, Assistant Professor of Mathematics and Philosophy, 1983-1989
Grinnell College, Coordinator of Summer Computing Programs, 1983-1989
Arizona State University, Assistant Professor of Philosophy, 1977-1983
Arizona State University, Visiting Assistant Professor of Philosophy, 1976-1977
University of Texas at Austin, Teaching Assistant, 1972-1976
University of Texas at Austin, Tutor, 1974-1975