Themistocles M. Rassias is a Greek mathematician and a Professor at the National Technical University of Athens. He received the Ph.D. in Mathematics from the University of California at Berkeley under the advice of Stephen Smale. He has been honored with three Honorary Doctorates. He has published more than 300 papers, 10 research books and has received more than 13,000 citations according to Google Scholar and more than 4,500 citations according to MathSciNet. His h-index is 43. He serves as a member of the Editorial Board of several international mathematical journals.