1. Teaching Assistant, Universit´e Joseph Fourier, Grenoble, France, as
“vacataire”, during the academic year 1996-97.
2. Teaching Assistant and Research Associate, Universit´e Joseph Fourier,
Grenoble, France, as “ATER”, during the academic year 1997-98.
3. Teaching Assistant and Research Associate, Ecole Normale Sup´erieure
de Lyon, France, as “ATER”, during the academic year 1998-1999.
4. Post-Doctoral researcher, ICTP, Trieste, Italy during the year 2000.
5. Assistant Professor, Sharif University of Technology, Tehran, Iran,
 2001- 2005.
6. Associate Professor, Sharif University of Technology, Tehran, Iran,
since 2005.