Charalampos Lemonidis is a professor of Mathematics Education at the Department of Primary Education - University of Western Macedonia (Florina, Greece). He is born in Kavala in 1961. He has graduated from Department of Mathematics - the Aristotle University of Thessaloniki. He received a master and a Ph.D. in Didactic of Mathematics from the University of Strasbourg (France). He is director of the Postgraduate Program in Department of Primary Education. He has founded the school entitled “Nature and Life Mathematics”. His scientific interests are number sense, use of technology in teaching/learning mathematics, mathematics disabilities, long life learning of mathematics.