Chelvi Ramakrishnan is currently a lead teacher in a primary school, and has taught for 35 years. She graduated with an MA in teaching and a BS in mathematics and has a Certificate of Education from NIE (National Institute of Education). She also has a diploma in the teaching of English as a second language from the Royal Society of Arts, a diploma in English studies, and a diploma in department management. Author of Math in Focus: Singapore Math by Marshall Cavendish, Chelvi Ramakrishnan has been writing primary mathematics books since 1997.