Ric Pimentel and Terry Wall have extensive teaching experience and have been Heads of Department. In a thirty year teaching career Terry Wall has taught in Turkey and the USA. He ran training courses for teachers in England and abroad including courses for the University of Cambridge International Examinations at the International Conference for Teachers held at Robinson College in Cambridge. Ric Pimentel was a teacher trainer specialising in IT applications for three years, and is currently teaching Mathematics in Cambridge. In addition to the first editions of Checkpoint Maths, other titles by these authors also endorsed by the University of Cambridge International Examinations are IGCSE Mathematics (Extended Syllabus) and IGCSE Core Mathematics.