Joo Beng was born on July 14th, 1960. Joo Beng's father was Teck Ghee Koh and his mother was Maizie Mo-May Yuen. His paternal grandparents were Koh Kim Han and Siew Lian Chia. He has a brother and a sister, named Joo Ann and Joo Kim. He is the second oldest of the three children.