· Acting Director (Language Speech Processing Industrial Systems Information Systems Institutes), "Athena" Research and Innovation Center2011–2016
· President And General Director, "Athena" Research and Innovation Center2011–2021
· Associated Faculty, "Athena" Research and Innovation Center2009–
· Professor Of Informatics Telecommunications, National & Kapodistrian University of Athens1997–
· Professor Of Computer Sciences, University of Wisconsin-Madison1986–1997