United States $727 Billion OCIO Mercer Appoints CIO Global Solutions Niall O’Sullivan as Global Chief Investment Officer (1/5/26) Succeeding Hooman Kaveh Who is Appointed as Executive Chair for Mercer’s Investment Platform to Lead Key Strategic Initiatives Including on M&A, Integrating AI and Custom Training & Development Resources, Niall O’Sullivan Has 30 Years of Investment Experience at Mercer, Neuberger Berman & QED Equity and Held Roles Including as Chief Investment Officer for Global Solutions, Europe & Multi-Asset Strategies (EMEA)
22nd April 2026 | Hong Kong
United States-based world’s largest OCIO (Outsourced Chief Investment Officer) Mercer ($727 billion AUM & AuA) has appointed CIO Global Solutions Niall O’Sullivan as Global Chief Investment Officer (1/5/26), succeeding Hooman Kaveh who is appointed as Executive Chair for Mercer’s Investment Platform to lead key strategic initiatives including on M&A, integrating AI and custom training & development resources. Niall O’Sullivan has around 30 years of investment experience including at Mercer, Neuberger Berman & QED Equity, and held roles including as Chief Investment Officer for Global Solutions, Europe & Multi-Asset Strategies (EMEA). Announcement (20/4/26): “Mercer, a Marsh business (NYSE: MRSH) and a global leader in helping clients realize their investment objectives, shape the future of work, and enhance health and retirement outcomes for their people, today announced that Niall O’Sullivan will become Global Chief Investment Officer, effective May 1, 2026. He succeeds Hooman Kaveh, who will assume the newly created role of Executive Chair for Mercer’s Investment Platform. Mr. O’Sullivan and Mr. Kaveh will report to Michael Dempsey, Mercer’s President for Investments and Retirement, and remain based in Dublin. As Global Chief Investment Officer, Mr. O’Sullivan 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. Going forward, all asset class teams will report to Mr. O’Sullivan … … In his new capacity, Mr. Kaveh will lead a number of key strategic initiatives, including a focus on M&A, integrating AI into Mercer’s investment processes, and providing custom training and development resources to help colleagues optimize Mercer’s expanding range of investment capabilities. He will continue to chair the Investment Governance Committee.”
“ $727 Billion OCIO Mercer Appoints CIO Global Solutions Niall O’Sullivan as Global Chief Investment Officer (1/5/26) Succeeding Hooman Kaveh Who is Appointed as Executive Chair for Mercer’s Investment Platform to Lead Key Strategic Initiatives Including on M&A, Integrating AI and Custom Training & Development Resources, Niall O’Sullivan Has 30 Years of Investment Experience at Mercer, Neuberger Berman & QED Equity and Held Roles Including as Chief Investment Officer for Global Solutions, Europe & Multi-Asset Strategies (EMEA) “
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Michael Dempsey, Mercer’s President for Investments and Retirement: “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 Mr.. “Continuing to work together, both Niall and Hooman will help accelerate the integration of our expanding investment capabilities, scale our differentiated offerings, and deliver consistent, impactful outcomes for our clients … … We greatly appreciate Hooman’s trusted counsel over the past twenty years and are pleased that our investment colleagues will continue to benefit from his leadership and experience during this next phase of growth for our business.”
Niall O’Sullivan: “It is an honor to lead Mercer’s global investment organization at this pivotal moment for institutional investors. Mercer is well-positioned to partner with clients to help them make sense of market volatility and support their unique long-term objectives. I’m eager to work across our global and regional teams to innovate compelling investment offerings that will delight investors and enable scalable growth.”
Niall O’Sullivan – Niall O’Sullivan is Chief Investment Officer, Global Solutions at Mercer. He has nearly 30 years’ experience managing global investment portfolios and programs. He is responsible for harnessing Mercer’s deep well of intellectual capital and investment capabilities to manage the implementation and execution of clients’ global investment strategies. Based in Dublin, he leads Mercer’s Chief Investments Office team across regions. Most recently, he served as Chief Investment Officer, Multi-Asset Strategies, EMEA, at Neuberger Berman, where he led the multi-asset team’s investment activity in the region. Prior to Neuberger Berman, he worked at Mercer for over a decade, rising to the role of Chief Investment Officer of Mercer’s Outsourced Chief Investment Officer (OCIO) business for Europe, Middle East and Asia.
Mercer – Mercer is a business of Marsh (NYSE: MRSH), a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective.
$727 Billion OCIO Mercer Appoints CIO Global Solutions Niall O’Sullivan as Global Chief Investment Officer (1/5/26) Succeeding Hooman Kaveh Who is Appointed as Executive Chair for Mercer’s Investment Platform to Lead Key Strategic Initiatives Including on M&A, Integrating AI and Custom Training & Development Resources, Niall O’Sullivan Has 30 Years of Investment Experience at Mercer, Neuberger Berman & QED Equity and Held Roles Including as Chief Investment Officer for Global Solutions, Europe & Multi-Asset Strategies (EMEA)
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