Mercer has announced that Niall O’Sullivan will become global chief investment officer (CIO), effective 1 May 2026.
O’Sullivan, who is currently global solutions, CIO, will lead the full range of Mercer’s investment capabilities, from research to investment solutions and performance, across traditional and alternative asset classes. He will also enable Mercer’s investment colleagues to operate effectively across the continuum of tools, advice and implementation and play an active role in integrating the investment expertise and capabilities gained from recent acquisitions.
“Niall’s deep knowledge of our investment business, passion for achieving strong investment outcomes for our clients, and ability to foster high-performing teams will position us strongly for the future,” said Michael Dempsey, Mercer’s President for Investments and Retirement.
O’Sullivan succeeds Hooman Kaveh, who will assume the newly created role of executive chair for Mercer’s investment platform.
