He performed postdoctoral research as an European Molecular Biology Organization (EMBO) fellow with Walter J. Gehring at the Biozentrum University of Basel (1978–1979) and Paul Schedl at the Department of Biology at Princeton University (1980–1983).

From December 2012 till April 2015 he was also the acting Head of Bioinformatics at the Centre for Functional Genomics at the Dept.

He has served on a number of national (Greek) and international committees and boards, and he is a member of EMBO.

After his retirement from active research, he concentrated on writing books of popular science, one of which ("Ιστορίες Γενετικής στην Καθομιλουμένη"-Genetics in everyday language, Crete University Press) was awarded a Special Prize by the Athens Academy in 2021.

His research interests include: In his youth, Kitsos Louis was a competition swimmer for Panathinaikos A.O.