David is an experienced mathematics education consultant and partner of Leigh-Lancaster Consulting. Previously, he was the Victorian Curriculum and Assessment Authority (VCAA) Mathematics Manager 1998-2021 and before that taught 7-12 mathematics for 20 years, including half of these as a mathematics head of department. He has extensive experience and expertise in school mathematics curriculum, assessment and pedagogy, professional learning, mathematics education research, resource development and the use of computational technology. David has longstanding interests in the nature of mathematical inquiry, connections between mathematics and mathematics education, and has worked on Victorian, national and international curriculum development projects.