Since october 2001 : Professor of Mathematical Finance, Birbeck College, University of London - U.K.

1994-2001 : Professor of Mathematics, Université de Reims Champagne-Ardenne - France.

1992-1994 : Netherlands Academy of Sciences Research Fellow, University Of Leiden, Netherland..

Fall 1991 : Visiting Assistant Professor, University Of Michigan, Ann Arbor, U.S.A.

1990-1991 : Research Fellow, Universidad Autonoma de Madrid, Spain.