Joan Moss, is an Associate Professor in the Department of Applied Psychology and Human Development and at the Institute of Child Study at OISE/UT. A former elementary school teacher, her research has focussed on the design of developmentally-based curricula highlighting areas of mathematics that are traditionally challenging for students. Her curriculum for rational number—decimals fractions and percentages—was published by McGraw Hill as part of a US mathematics textbook series. Her research on early algebra has appeared in numerous international publications. Since 2011, Joan has been co-Principal Investigator of the Math for Young Children (M4YC) project, which has involved her in working with over 100 teachers and their students to support the teaching and learning of spatial reasoning in early years classrooms. Most recently, she has collaborated with the Robertson Program for Inquiry-Based Teaching in Math and Science to expand the M4YC initiative to include collaborations in four First Nations communities and the Rainy River District school Board. Joan has won many honours and awards including the award for Distinguished Contributions to Teaching.