1989 -	Professor Department of Statistics, The Athens University of Economics and Business, Athens, GREECE.
2002 - 2003	Visiting Professor Department of Statistics, Trinity College, Dublin, IRELAND.
1986 - 1989	Associate Professor Department of Statistics and Informatics, Athens University of Economics and Business, Athens, GREECE.
1983 - 1986	Associate Professor Department of Mathematics and Statistics, University of Crete, GREECE.
1982 - 1983	Associate Professor Department of Statistics and Actuarial Science, University of Iowa, Iowa City, USA.
1980 - 1982	Assistant Professor Department of Statistics, University of Missouri-Columbia, Missouri, USA.
1979 - 1980	Lecturer Department of Statistics, Trinity College, University of Dublin, IRELAND.