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- 1978–1983
- Teaching Assistant, Fachbereich Mathematik
- 1981–1981
- Teaching Assistant, Fachbereiche Biologie & Chemie
- 1981–1982
- Research Assistant, Fachbereich Architektur
- 1981–1983
- Research Assistant, Interdisciplinäre Arbeitsgruppe Mathematisierung
- 1983–1991
- Teaching Assistant, Departments of Mathematics & Astronomy and the Department of Applied Mathematics
- 1985–1991
- Sessional Lecturer, Departments of Mathematics & Astronomy and the Department of Applied Mathematics
- 1990–1991
- Part-time instructor, Correspondence Program of the Department of Continuing Education
- 1991–1993
- Assistant Professor of Mathematics
- 1993–1998
- Adjunct Professor of Mathematics
- 1993–1998
- Adjunct Professor of Mathematics
- 1993–1998
- Assistant Professor of Mathematical and Computing Sciences
- 1998–2003
- Associate Professor of Mathematical and Computing Sciences
- 2003–present
- Professor of Mathematical and Computing Sciences