Ms Chai, who holds a PhD in applied finance and actuarial studies, joins the team following the recent appointment of Scott Lawrence as head of investment solutions.
Omega co-founder and director of investments Matthew McCrum said Ms Chai would perform an important strategic support function within the team.
"Celeste brings strong skills in quantitative research and modelling. As demand for the unique Omega investment capability extends, her contribution to broadening our internal capacity is welcome," Mr McCrum said.
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"Momentum for the Omega partnership approach is building and we are pleased to be able to attract new investment talent to the team."
