David Wagner is a professor in mathematics education and Associate Dean of Education at the University of New Brunswick. He serves as Co-Editor-in-Chief of Educational Studies in Mathematics. He is interested in human interaction in mathematics and mathematics learning and the relationship between such interaction and social justice. His research has focused on positioning and authority structures in mathematics classrooms, teaching approaches that support sustainability, and ethnomathematical conversations in Indigenous communities. He has taught grades 7-12 mathematics in Canada and eSwatini.