• University of California , Berkeley , USA
• Research Assistant of Mathematics, 1975-1977
• National and Technical University of Athens , Greece
• Research Fellow of Mathematics , 1978
• American College of Greece , Athens , Greece
• Assistant Professor of Mathematics , 1981-1985
• Associate Professor , 1985-1992
• University of Maryland , Campus in Athens , Greece
• Adjunct Professor of Mathematics , 1982-1983
• Embry-Riddle University , Campus in Athens , Greece
• Adjunct Professor of Mathematics , 1983-1984
• Hellenic Military Academy , Greece
• Adjunct Professor of Mathematics , 1982-1983 ; 1985-1986
• Hellenic Airforce Academy, Greece
• Adjunct Professor of Mathematics & Theoretical Mechanics, 1984 ; 1988

• National and Capodistrian University of Athens , Greece
• Lecturer , 1989-1992
• Assistant Professor , 1992-1996
• Associate Professor , 1996-2000
• Professor of Mathematics , 2000-

Selected Visiting Positions

• University of Sao Paulo , Brazil
  • Special Visiting Professor of Mathematics , 1988
• University of Turin , Italy
  • Visiting Professor of Mathematics , 1989