People Moves: Marsh Names Quest as UK CEO, Succeeding Lay; TMK Taps Carpenter’s Sitki as Cyber Re U/W; Everest Promotes 2 Key Leaders in Facultative & Hybrid Re

This edition of International People Moves details appointments at Marsh, Tokio Marine Kiln (TMK), and Everest Group.

A summary of these new hires follows here.

Marsh Names Quest as UK CEO, Succeeding Lay

Insurance broker Marsh announced the appointment of Lisa Quest as UK CEO, in addition to her current role as head of UK and Ireland Oliver Wyman, effective April 6, 2026.

Quest will be based in London and report to Flavio Piccolomini, CEO, International, Marsh. Quest succeeds Chris Lay, who is retiring from the business.

In this additional role, Quest will work with the UK’s business CEOs to shape Marsh UK’s commercial strategy. She will focus on strengthening and expanding client relationships across Marsh’s four businesses as well as developing innovative, data-driven client solutions that support organisations operating in the UK’s diverse economy.

Quest joined Oliver Wyman in 2006. Following time as a private equity investor, she returned in 2013, going on to be appointed as co-head of the Government and Public Institutions Practice, Europe. In 2023, she was appointed to the additional role of Head of UK and Ireland. Her work draws on her global experience, where she has extensive expertise in areas such as data and analytics, workforce of the future, and organisational design.

In addition, she sits on the Canada-UK Chamber of Commerce Board, is a guest lecturer at the London School of Economics’ Centre for Risk and Regulation, and is a Member of the Leadership Council at National Numeracy. Through these roles, Quest works extensively with HM Government on critical national priorities, including pay equity, defense financing, flood risk and resilience, and has supported the creation of new government bodies, including the National Wealth Fund.

TMK in Taps Carpenter’s Sitki as Cyber Re Underwriter

Tokio Marine Kiln (TMK), the specialist insurer, announced it has appointed Ben Sitki as an underwriter within its Cyber Reinsurance Solutions team. He takes up his new role with immediate effect and reports to Cesar Silvestre, head of Cyber Reinsurance Solutions.

Sitki brings nearly two decades of re/insurance experience to his new role, with particular expertise in developing cyber solutions for businesses in the Middle East and Africa. He joins from Guy Carpenter where he served, most recently, as senior vice president, and has previously held roles at Willis Re and Canopius.

The appointment follows the launch of TMK’s cyber reinsurance offering in November, with Cesar Silvestre joining to lead the department. It builds on the introduction of the insurer’s flagship cyber insurance product TMK Cyber Ctrl and Enterprise Ctrl, an enhanced cyber errors and omissions (E&O) insurance solution

Everest Promotes 2 Key Leaders in Facultative & Hybrid Re

Everest Group Ltd., the Bermuda-based re/insurer, announced two key leadership appointments within its Facultative & Hybrid Reinsurance business, further strengthening its Global Wholesale & Specialty platform.

Michael Cellura has been appointed head of Facultative & Hybrid Reinsurance, reporting to Jason Keen, executive vice president and chief executive officer of Global Wholesale & Specialty Insurance. Since joining Everest in 2022, Cellura has demonstrated strong executive leadership across the organization. In this role, he will oversee Everest’s global facultative and hybrid reinsurance platform, including underwriting strategy, portfolio management, and regional alignment across the business.

Trevor Gallagher has been appointed chief operating officer, Facultative & Hybrid Reinsurance, a newly created role, reporting to Cellura. Gallagher will be responsible for operational execution, and platform optimization, supporting the continued scale and performance of the global business. Since joining Everest in 2023, he has since been instrumental in strengthening operational discipline and supporting the build-out of the Facultative & Hybrid Reinsurance platform.

“Michael and Trevor are highly respected leaders whose experience and strategic focus reflect the strength of Everest’s leadership bench,” said Keen. “Facultative & Hybrid Reinsurance is central to our strategy, enabling us to provide flexible underwriting and differentiated solutions for complex risks. Under their leadership, Everest will continue to build a high-performing platform grounded in disciplined underwriting, strong execution, and close broker and client collaboration globally.”