Onchuma “Fay” Durongdej, known for her sophisticated and timelessly elegant personal style, is also a well-regarded business executive who leads the premium natural mineral water brand Iceland Spring and the integrated water management company Mazuma. She is a second-generation member of the Durongdej family that owns Mazuma, which was founded by her father, Rittichai Durongdej, in 1993. The family also owns consumer lending business MeMoney, which she also helps lead.

Fay Durongdej is married to real estate developer Pitipat Preedanont, with whom she has twins, Chloe and Colin.