Dimitris Diamantidis is a PhD student at the Department of Educational Studies of NKUA, a member of the Educational Technology Lab and a Mathematics Teacher in Secondary Education. He is experienced in teacher training with the use of Digital Tools, in pre-service Mathematics’ teacher training (as mentor during in-classroom training) and in in-service teacher training (as speaker/designer of official workshops and seminars). He has been involved in 3 European Projects and has worked as a training material designer for use of Digital Media in teaching Mathematics.