Mapping the field and documenting the contribution

Abstract

In this opening chapter we want to do more than provide an overview of the book and summaries of its chapters. We want to set the scene and provide a rationale for a book celebrating the life's work and contribution of a valued academic. Through this book we want to be able, with a group of a dozen or so other colleagues, to say something about the field of mathematics education through a focus on the contribution of one key player - Stephen Lerman.