Appointments
University of Illinois at Urbana-Champaign
- 2002: Professor of Mathematics Education Emeritus
- 1971-2002: Professor, Curriculum & Instruction, College of Education
- 1968-1971: Associate Professor, College of Education
- 1965-1968: Assistant Professor, College of Education
- 1963-1965: University Fellow, College of Education
National Science Foundation (on leave from University of Illinois)
- 1992-93: Founding Director, Division for Research, Evaluation and Dissemination
- 1991-92: Head, Office for Studies, Evaluation and Dissemination
- 1990-91: Head, Office for Studies and Program Assessment
University of Victoria
- 1962-1963: Lecturer, College of Education
University of British Columbia
- 1961-1962: Lecturer, Department of Mathematics
- 1960-1961: Graduate Assistant, College of Education
1955-1959: Public school teacher, mathematics and science, British Columbia, Canada