Meet our Lexington Singapore School family.

The values that define our teachers also define our practice, and at Lexington Singapore School, we pride ourselves in hiring highly qualified teachers.




Co – Founder and Principal

Singapore Math ® Specialist

Kar Hwee Koh, Ed. M.,  has been teaching Singapore Math® in premier schools in Singapore before relocating to Lexington, MA. She started Lexington Singapore School through encouragement from her family, friends and neighbors. She believes in setting high expectations for her students and nurturing creative and confident math problem solvers. 

  • Certified Teacher in both Massachusetts State and the Republic of Singapore
  • Advanced Master of Education (Ed.M), Columbia University Teachers College
  • Master of Education, University of Western Australia, Higher Distinction
  • Postgraduate Diploma in Education, National Institute of Education Singapore, Distinction
  • Bachelor in Electrical Engineering, National University of Singapore

Jean S C Chong was born and educated in Singapore. She has 2 Associate Degrees, one in Business Studies and the other in Culinary Arts and Science. In addition, she also holds a certified degree in Montessori Early Childhood and Development issued by the American Montessori Society. She has been a teacher for preschool/kindergarten in the past 19 years and a Montessori teacher in the last 11 years of the 19 years. She is currently a Curriculum Director at Rockland Montessori Academy.

Wei Li Pek is from Singapore and received her bachelor’s degree from University of Essex (UK) in Electronic Systems Engineering with First Class Honors. Wei Li is a strong believer that early math matters. She believes the mathematics that kids are doing in Grades K-2 lays a strong foundation for the work they are going to do beyond that and sets them on a path towards numeracy skills and confidence in later life. In her spare time, Wei Li enjoys crafting, skiing and spending time with her family.

Deborah Yeo is Singapore trained certified math teacher who taught elementary/middle school mathematics in Singapore before relocating to Boston. Deborah has a passion for teaching and it brings her great joy to see children get excited about learning math. She believes that learning for every child occurs differently and will customize her teaching approach for each student. In her leisure time, Deborah enjoys outdoor activities such as hiking along with her husband and two lovely daughters.  Deborah graduated with Distinction from the National Institute of Education in Singapore and recently completed her Master of Education from Harvard University.

Ruth Kim is from NYC and has been raising her 3 children in the Boston suburbs. As a parent and educator in the public schools, she is constantly studying ways to effectively influence a child’s development through positive challenges and high standards. She believes that hard work and effort, set within a foundation of trust and self-respect are essential components of learning. Ms. Kim was introduced to Singapore Math 10 years ago, during a time of research into various Mathematics programs. She particularly appreciated how Singapore Math validates and builds on the instinctive connection students make with Math concepts. Over the years, Ms. Kim has used Singapore Math skills when teaching her own children and with students who present with various learning profiles. Ms. Kim holds a Bachelor’s degree in English language & Literature from Gordon College and a Master of Education in Moderate Disabilities from Lesley University.

* Singapore Math ® is a trademark of Marshall Cavendish Education Pte Ltd and Singapore Math Inc. Lexington Singapore School is not affiliated to Marshall Cavendish Education Pte Ltd and Singapore Math Inc.