Associate Visiting Professor, Carleton
University, School of Mathematics and Statistics.
26 June to 12 July 2008, Visiting Research Scholar at:
the Department of Mathematics and Statistics in the Faculty of Society, University of Regina, Regina (
invited by Professor Allen Herman).
17 August to 14 September 2007, Visitor Professor at:
Euler International Mathematical Institute and Petersburg Department of V.A.Steklov Institute of Math-
ematics, St. Petersburg Russia, ( invited by Professor Ilya Ponomarenko).
12 July to 12 September 2006, Visitor Professor at:
Euler International Mathematical Institute and the Petersburg Department of V.A.Steklov Institute of
Mathematics, St. Petersburg, Russia, (invited by Ilya Ponomarenko).
25 May to 30 July 2005, Visiting Research Scholar at:
the Department of Mathematics and Statistics in the Faculty of Society, University of Regina, Regina (invited by Professor Allen Herman).