Key Takeaways
- • Mercer names Niall O'Sullivan as global chief investment officer, effective May 1, 2026, as the $727 billion OCIO and consulting giant continues strategic leadership overhaul in investment management.
- • Garvan McCarthy promoted to newly created global alternatives CIO role, overseeing private equity, private credit, real assets, and hedge funds across global and regional teams while maintaining EMEA and Asia CIO responsibilities pending successor appointment.
- • Hooman Kaveh, current global CIO, transitions to newly created executive chair position, signaling organizational restructuring focused on private markets expansion and future growth opportunities.
- • Leadership expansion reflects Mercer's strategic positioning to strengthen capabilities in alternatives and private markets as institutional clients increasingly allocate to non-traditional asset classes.
Summary
Mercer announced on April 20, 2026, a significant reorganization of its investment leadership structure, naming Niall O'Sullivan as its new global chief investment officer effective May 1. The move represents a continuation of the $727 billion OCIO and consulting giant's broader investment leadership overhaul aimed at positioning the firm to capture emerging opportunities in alternative assets and private markets.
As part of the same leadership expansion, Mercer created a new global alternatives CIO role and appointed Garvan McCarthy to the position. In this capacity, McCarthy will lead Mercer's global alternatives platform, comprising teams responsible for private equity, private credit, real assets, and hedge funds across global and regional operations. McCarthy will retain his existing responsibilities as EMEA and Asia CIO until a successor is named, allowing for continuity during the transition period.
The organizational restructuring also includes the promotion of Hooman Kaveh, the current global CIO, to a newly created executive chair role. This transition reflects Mercer's strategic intent to strengthen its investment architecture while expanding its capabilities in private markets—an increasingly critical area of focus for institutional investors and OCIO clients.
The leadership changes underscore Mercer's commitment to building specialized expertise across alternative investment categories at a time when institutional allocators continue expanding exposure to private markets. By creating dedicated CIO roles for alternatives alongside the global CIO appointment, Mercer is positioning itself to deepen client relationships and enhance advisory capabilities across both traditional and non-traditional asset classes.
As part of the same leadership expansion, Mercer created a new global alternatives CIO role and appointed Garvan McCarthy to the position. In this capacity, McCarthy will lead Mercer's global alternatives platform, comprising teams responsible for private equity, private credit, real assets, and hedge funds across global and regional operations. McCarthy will retain his existing responsibilities as EMEA and Asia CIO until a successor is named, allowing for continuity during the transition period.
The organizational restructuring also includes the promotion of Hooman Kaveh, the current global CIO, to a newly created executive chair role. This transition reflects Mercer's strategic intent to strengthen its investment architecture while expanding its capabilities in private markets—an increasingly critical area of focus for institutional investors and OCIO clients.
The leadership changes underscore Mercer's commitment to building specialized expertise across alternative investment categories at a time when institutional allocators continue expanding exposure to private markets. By creating dedicated CIO roles for alternatives alongside the global CIO appointment, Mercer is positioning itself to deepen client relationships and enhance advisory capabilities across both traditional and non-traditional asset classes.
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