Before moving to New York, Eley and Harris were at the Sydney start-up BMF, where they worked on accounts including Castlemaine XXXX and Ikea.
In 1999, they won a Cannes Lion for "Larry", a TV spot for Executive B Stress Formula.
The print specialists Ng and Loke won the inaugural Asian Young Creative of the Year award in 2004.
At Burnett, they worked on campaigns for McDonald's and Asia-Pacific Breweries. The pair's campaign for Philips Lighting was the 13th-most-awarded campaign in the 2004 Gunn Report and took home silver and bronze Lions from the Cannes International Advertising Festival in 2004.
Ng said: "Mother is one of the world's most admired agencies and we hope to add a touch of Singapore to its diverse mix of creative talents."