Leonie Anstey is an educational consultant in instructional leadership and mathematics and numeracy education. Leonie was formerly a principal in Victoria and she has also worked as a ‘Teacher and Principal Coach’. Leonie’s teaching background includes secondary (mathematics and physics) and primary mathematics. She has supported system and school-based projects focused on building teachers’ knowledge and practices for mathematics teaching in primary, secondary and early childhood settings. Leonie also consults and supports principals and system leaders to implement instructional leadership strategies that build school capacities for effective mathematics teaching and learning.