Doug Clarke is an Emeritus Professor of Mathematics Education at the Australian Catholic University (Melbourne), where he directed the Mathematics Teaching and Learning Centre for 25 years. Doug also directed the Early Numeracy Research Project, exploring effective approaches to numeracy learning in the early years in 70 Victorian primary schools. A more recent project (Learning from Lessons) focused on the ways in teachers took what they learned from a given lesson in preparing for and teaching the following lesson. Doug’s professional interests include problem solving and investigations, manageable and meaningful assessment, and the professional growth of mathematics teachers. Doug enjoys working alongside teachers and students, as they seek to make mathematics relevant, challenging, and enjoyable.