Kathy Ernst has served as co-founder of an alternative pre-K-6 school, classroom teacher, developer and teacher of gifted programs, adjunct professor, math coach, and consultant. She holds a MS.Ed in Educational Leadership from Bank Street College. For over thirty years she has taught math problem solving to students and teachers and has provided support to schools and systems throughout the U.S. to improve mathematics education. Kathy is a senior advisor with Thinking Foundation.

Sarah Ryan is an elementary school teacher in the Delaware public schools. She also provides professional development for the Math and Science Education Resource Center at the University of Delaware. Sarah has a MS in Early Childhood and Elementary Education from Bank Street College of Education. Previously, she has worked as a teacher and math coach in the New York City public schools and as an advisor in the Math Leadership Program at Bank Street College.