Dr. Yeap Ban Har teaches mathematics education courses at the National Institute of Education, a teacher education institute in Nanyang Technological University in Singapore. His research interests include problem solving and problem posing, early numeracy, and teacher professional development. He holds a Master of Education, a Master of Arts in Southeast Asian Studies, and a doctorate in mathematics education and has served on the editorial board of two mathematics education journals -- Mathematical Thinking and Learning and The Mathematics Educator. Dr Yeap has written several mathematics textbooks based on the Singapore Mathematics approach, as well as articles and chapters in various mathematics education publications including articles on bar modeling in journals such as Mathematics Teaching in Middle Schools and Mathematics Teaching. His recent publications include a chapter in an International Commission on Mathematical Instruction (ICIM) study publication and Pedagogy of Engaged Mathematics Learning.