Assistant Professor , University of Craiova, Department of Applied Mathematics, 1992 - 2008

Teaching Assistant, Purdue University, Indiana, US, Department of Mathematics, 1995 - 1997

Teaching Assistant, Kansas State University, Kansas, US, Department of Mathematics, 1994 – 1995

Teaching Assistant , Technical University Bucarest, Depart of Mathematics II, 1988 - 1991

Scientific Researcher, ITCI (Institut de Tehnica de Calcul si Informatica) Bucuresti 1984 - 1988