Helen Leis – Biography
Last update: March 23, 2026Executive profile
Helen served as Co-Head of Mergers and Acquisitions, Americas at Marsh McLennan.
Helen Leis is currentlyGlobal Head of Leadership and Change, Co-Head of Mergers and Acquisitions, Americas at Oliver Wyman - View - Oliver Wyman org chart
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- At Oliver Wyman, Helen Leis has 278 colleagues including Ted Moynihan (CEO), Huw van Steenis (Vice Chairman of the Board)…
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- Helene Leissner - Head of Transformation and Insights - Tele2 IoT
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- In the Consulting industry, Helen Leis has 20,538 colleagues in 795 companies located in 42 countries. 11,741 executive movements have been recorded in the last 12 months. Learn more about Consulting.
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