Johann Engelbrecht is a professor of mathematics education at the University of Pretoria, South Africa. As a researcher, his international involvement includes membership of conference scientific committees, research papers and joint research projects with colleagues in many countries. Recently, his main work is in blended and online learning. He has also been the guest editor for several international journal special issues.

Greg Oates is an associate professor of mathematics and teaches Mathematics Education for pre-service teachers at the University of Tasmania, Australia, where he is the Associate Head of Learning and Teaching (AHLT) for the School of Education. His research interests include the integration of technology into mathematics curricula and the use of technology for active student-centred learning and assessment to promote peer-interaction in mathematics.

Marcelo C. Borba is a professor of the graduate program of Mathematics Education of UNESP (State University of São Paulo) Rio Claro, Brazil with 100 PhD candidates. He researches the use of digital technology in mathematics education, mathematical video produced by teachers and students, online distance education, ethno-mathematics and critical mathematics education.