- Professor, Faculty of Education, 51猎奇入口 (2000鈥損resent)
- Associate Member, Department of Mathematics, 51猎奇入口 (1994鈥損resent)
- Associate Professor, Faculty of Education, 51猎奇入口 (1994鈥�2000)
- Visiting Professor, Department of Science Education, Technion 鈥� Israel Institute of Technology (1996鈥�1997)
- Assistant Professor, Faculty of Education, 51猎奇入口 (1991鈥�1994)
- Assistant Professor, Department of Mathematical Sciences, Northern Illinois University (1989鈥�1991)
- Faculty Member, Institute for Secondary Mathematics and Computer Science Education, Kent State University (1990, 1991 summers only)
- Instructor, Department of Science Education, Technion 鈥� Israel Institute of Technology (1985鈥�1989)
- Research Assistant, School of Education, University of Haifam (1981鈥�1985)