Derek Holton trained as a secondary teacher but has spent most of his life as an academic, doing research in combinatorics and various aspects of mathematics education, including problem solving. However, he has never lost his interest in trying to show students what he enjoys about mathematics. For almost 25 years he worked in New Zealand, where he was part of the group that prepared students to take part in the International Mathematical Olympiad. An Honorary Professor at the Melbourne Graduate School of Education, Derek is now retired but still works with students and teachers at every opportunity.
Duncan Symons is a Lecturer of Science and Mathematics Education at the University of Melbourne. His research interests include inquiry-based and investigative approaches to mathematics education in the primary years. He is also interested in how mathematics can be embedded within the broader curriculum. He currently facilitates a program for Teacher Candidates at the University of Melbourne that focuses on the adoption and promotion of Science, Technology, Engineering and Mathematics (STEM) as a means to achieve integration.