Throughout her career as a math educator, curriculum developer, textbook author and PD facilitator, Cathy has worked extensively with school administrators, teachers and their students throughout Ontario, Quebec, Northwest Territories and Nunavut. Her work with Indigenous peoples includes professional development initiatives in Ahkwesahsne Mohawk Board of Education, Beaufort Delta Education Council, Cree School Board, and Wikwemikong Board of Education. Throughout her 33 years as a classroom teacher of all grades K-8, Cathy has been active in the areas of curriculum development and assessment, both locally & provincially. She has worked with E.Q.A.O. on both anchor selection and assessment (Gr. 3, 6, 9) and helped to write and in-service the Ontario Ministry Exemplars in Math Gr. 7/8. She is also Past President of O.A.M.E. (Ontario Association for Mathematics Education). Currently Cathy is involved in helping teachers translate research into practice, specifically dealing with the implications of conceptual development and learning trajectories in mathematics.