Dr. Marc Husband earned his Ph.D. in Education from York University in 2019 and has been teaching mathematics since 1999. His work explores how teachers use students’ ideas as the starting point for meaningful mathematical learning. Marc’s recent research focuses on para-imaging — re-presenting and extending students’ mental math strategies to make their thinking visible and visual during public classroom discussions like Number Talks. He approaches professional learning through collaborative inquiry, creating spaces where teachers and students learn with and from one another. He is also interested in geometry and the role of symmetry, particularly its use in reasoning and proving relationships. Across all of Marc’s work, Pirie and Kieren’s Theory for the Dynamical Growth of Mathematical Understanding provides a foundation for supporting teachers and students in seeing mathematics as something that grows through shared classroom experiences.