Constantinos Xenofontos is Associate Professor of Mathematics Education at the Department of Primary and Secondary Teacher Education, Oslo Metropolitan University (Norway). He has previously worked at the University of Nicosia (Cyprus) and the University of Stirling (Scotland, UK). He has also worked as a school teacher in Cyprus. His research interests focus on mathematics teacher education (both initial teacher education and continuous professional development). In his work, he adopts sociocultural and sociopolitical perspectives, to investigate mathematics teachers’ beliefs, knowledge, and practices.