Margaret Sangster was formerly Principal Lecturer and Programme Director of the BA (Hons) in Primary Education at Canterbury Christ Church University, UK. She worked for many years as a primary teacher, and as a mathematics advisory teacher before moving to Higher Education. She is the editor of Developing Teacher Expertise (Bloomsbury, 2012) and Challenging Perceptions in Primary Education (Bloomsbury, 2015), and author of several books on mathematics, primary and secondary teaching.