David Greenwood is the Head of Mathematics at Trinity Grammar School and has also taught mathematics for many years at Scotch College. He is an experienced author of mathematics and technology texts which apply to all secondary levels. He has presented at many conferences and run a number of workshops outlining the implementation of VELS, and the use of technology including graphics calculators and dynamic geometry software.
David Robertson is the Head of Mathematics and VCE coordinator at Mowbray College. He has been an author for the last 10 years, and a teacher for the last 26 years in both the state and private school system. He has written two series of books in the Maths area, and also currently teaches Mathematics to students in Years 7 - 12.