Scientific Employment and Academic Responsibility

		McGill University, Departmant of Physics, July 2005-August 2006, on sabbatical leave.
		University of Potsdam, Germany; Oct. 1995- Oct. 1996, Alexander von Humboldt Fellow.
		Sharif University of Technology, Iran, Chairman, Department of physics 1983-1985, 1991-1993.
		Sharif University of Technology, Iran, Professor of Physics 1989-.
		Vienna University, Institute for Theoretical Physics, September 1986-October 1987, on sabbatical leave.
		Sharif University of Technology, Iran, Associate Professor 1979-1989.
		University of Cologne, Germany, 1978-79, Alexander von Humboldt Fellow.
		Vienna University, Austria, Assistant Professor 1972-1977.
		Sharif University of Technology, Faculty, 1979- Present.