"Most influential at the start of my academic career was Lev Vygotsky’s work: Mind in Society and Thought and Language. As a mathematics education researcher I am always working between educational theory and literature in mathematics education. With my early work on teaching mathematics in multilingual classrooms, David Pimm’s book Speaking Mathematically was pivotal in turning my attention to mathematical language more generally. More recently, with my interest in mathematical knowledge in and for teaching and particularly what is produced as mathematics in teacher education practice, influential resources are Basil Bernstein’s Pedagogy, Symbolic Control and Identity, and Anna Sfard’s Thinking as Communicating and then the extensive work done by Deborah Ball in the past decade. I could go on, as I enjoy reading, and spend time relaxing with whodunnit."