Dr Tan possessed a wealth of experience in teaching and leading Mathematics learning in Singapore with students across different age groups, including 13 to 16 year olds at Raffles Institution, and 17 to 18 year olds at Jurong Junior College, where he also held the position of Head of Department for Mathematics. As Teaching Fellow at the Mathematics and Mathematics Education Academic Group in the National Institute of Education, Nanyang Technological University, Singapore, he taught pre-service teachers enrolled in the Bachelor of Science (Education) for undergraduates with pre-university qualifications, and the Postgraduate Diploma in Education programme for university graduates. As the Principal Master Teacher and Mathematics Cluster Head at AST, he leads a team of Maths Master Teachers to spearhead curricular and pedagogical initiatives. Dr Tan holds a Master of Information Technology in Education from University of Melbourne, Australia, and a Master of Science in Mathematics as well as a Doctor of Philosophy in Mathematics Education from the National Institute of Education, Nanyang Technological University, Singapore. He is interested in mathematical modelling, cognitive psychology and professional learning of teachers, and regularly engages in professional development and computational thinking programmes, and research projects involving mathematical applications and modelling. He is part of the management committee for Singapore Mathematical Society and Singapore representative for the International Mathematical Modeling Challenge. As the appointed Singapore Governing Board member of SEAMEO Regional Centre for QITEP in Mathematics, Dr Tan also contributes to the advancement of Mathematics in South East Asia.