Klaas Bootsma was head teacher of mathematics at Ambarvale High School in Campbelltown and has taught at Lurnea and Grantham high schools. He was a senior HSC marker and has worked on the HSC Advice Line. Klaas also co-wrote New Century Maths 11–12 Mathematics Standard 2.

David Badger was principal of Toongabbie Christian School, deputy principal at Mt Annan Christian College and head teacher of mathematics at Eagle Vale High School in Campbelltown. He has been involved in HSC marking and has worked on the HSC Advice Line. David’s passion is to make mathematics interesting, practical and accessible to all students.

Sarah Hamper teaches at Abbotsleigh School in Wahroonga and has taught at Meriden and Tara Anglican schools. She has an interest in gifted and talented (GAT) students and girls education. Sarah also co-wrote New Century Maths 11–12 Mathematics Standard 2.

Robert Yen taught at Hurlstone Agricultural High School. He co-wrote New Century Maths 11–12 Mathematics Standard 2, co-edited Reflections, the MANSW journal, and now works for Cengage as the mathematics publisher.

Ilhea Yen is head teacher of mathematics at Canterbury Girls High School. She also co-wrote resources for New Century Maths 9-10.