Marian Small is an international professional developer, conference speaker, bestselling author, a former dean of education at the University of New Brunswick, and longtime professor of mathematics education. Visit Marian's website at www.onetwoinfinity.ca for in-person and online professional development. Amy Lin is the director of teaching and learning at Seneca College. Amy has worked as a teacher in elementary, secondary, and post-secondary levels and as a mathematics coach, a curriculum consultant, administrator, and ministry researcher.