?ass???; born April 2, 1951) is a Greek mathematician, and a Professor at the National Technical University of Athens (E????? ?ets?ß?? ????te??e??), Greece.
He has published more than 300 papers, 10 research books and 45 edited volumes in research Mathematics as well as 4 textbooks in Mathematics (in Greek) for university students.
His research work has received more than 15,000 citations according to Google Scholar and more than 5,000 citations according to MathSciNet.
His h-index is 45.
He serves as a member of the
Editorial Board of several international mathematical journals.