Gan Kee Soon has been an inspector of schools, a principal of a secondary school, and a lecturer at the National Institute of Education, Nanyang Technological University, Singapore, where, for 22 years, he trained and supervised primary mathematics teachers. He graduated from the University of Pittsburgh with an MA in elementary education in 1986. He also has a BS in mathematics and a diploma in education from the University of Malaya (Singapore) and is the co-author of Math in Focus: Singapore Math by Marshall Cavendish.