Ong Kian Heng holds a Master of Education in Mathematics Education. In his more than 15 years of teaching mathematics at the primary levels, he has written books for both international as well as local publishers. He has conducted mathematics workshops on problem solving, heuristics and the usage of manipulatives to develop the professional capacity of practising teachers. He has also conducted mathematics workshops for parents to equip them with the necessary mathematical knowledge to help their children in the subject. He has presented papers in various conferences, both locally and overseas.