Derek HoltonDerek 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 sow 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. Read More Read Less