John LeyJohn is a passionate and innovative mathematics educator. He is currently completing his PhD in mathematics education, while lecturing and tutoring at Australian Catholic University and the University of Western Sydney. John has held an array of teaching positions including Head of Mathematics, Assistant Principal and Acting Principal. An experienced senior marker for the HSC, John was a member of the 2012-2014 assessment committees, setting the HSC calculus course examinations. John is the lead author of the Oxford Insight Mathematics series for NSW. Michael FullerMichael has been involved in Mathematics in NSW for many years. He held the position of Head of Mathematics at Killara High School in Sydney for 24 years. In his retirement, Michael is now a key author on the Oxford Insight Mathematics series for NSW. Daniel MansfieldDaniel is a Lecturer in Mathematics at UNSW Sydney. In 2015 he was presented with a Vice Chancellor's Award for Teaching Excellence, and in 2017 he won one of the KPMG Inspiring Teacher Awards. He has previously created online professional development courses for secondary school teachers, and presented on the subject of Networks at the 2017 MANSW Annual Conference.