
Dr. David Costello is an author who has recently published two books Making Math Stick: Classroom strategies that support the long-term retention of math concepts and Using What Works: Strategies for Developing a Literacy-Rich Environment in Math. David is a principal, who has held many roles. He taught in the primary division before assuming roles of numeracy interventionist, numeracy coach, numeracy leader, and curriculum consultant for Prince Edward Island. David has also instructed university courses focused on curriculum, differentiation, mathematics, and literacy. He facilitates professional learning sessions in the area of mathematics and school development.