Marsh appoints Deborah Wardle as Mercer’s International Chief Investment Officer
NEW YORK, July 20, 2026 ¬─¬ Marsh (NYSE: MRSH), a global leader in risk, reinsurance and capital, people and investments, and management consulting, today announced that Deborah Wardle has been appointed Mercer’s International Chief Investment Officer (CIO), effective immediately. She will continue to be based in London and report to Niall O’Sullivan, Mercer’s Global CIO.
Wardle succeeds Garvan McCarthy, who will continue in his role as Global Alternatives CIO.
As International CIO, Wardle will lead Mercer’s investment teams across hubs in the UK, Europe, India and Middle East, and Asia, helping drive strong portfolio outcomes for clients. She will also partner with regional commercial and investor segment leaders to strengthen Mercer’s client solutions, connecting its asset class expertise and investment platform capabilities.
“Deb is a natural leader with deep investment expertise and a strong understanding of how to deliver outcomes for clients,” said O’Sullivan. “Her breadth of experience across traditional and alternative investments, together with her portfolio management expertise, positions her well to lead our international investment teams through the next phase of our growth.”
“We have an exceptionally strong team across our regions,” said Wardle. “As I step into this role, I look forward to working closely with my colleagues to build on that strong foundation and position us to continue delivering for our large asset owner clients in this ever-evolving investment environment.”
Wardle has built her career at Mercer over the past 16 years. She brings deep experience across asset classes and portfolio management, with expertise in both traditional and alternative investments, to her new role. In her most recent role as Head of Portfolio Management for Europe, India and the Middle East, she worked with multidisciplinary teams to translate client objectives into tailored investment solutions.
Prior to that, she was UK Alternatives Leader, where she was responsible for bringing Mercer’s alternatives capabilities to clients and implementing private market and hedge fund allocations within client portfolios.