SEI appoints two lead board members 13 August 2025UK Reporter: Tahlia Kraefft
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SEI Investments (Europe) Limited (SIEL), has selected Diane Seymour-Williams as board chair and David Lawton as an independent non-executive director.
Seymour-Williams became part of SIEL’s board in 2019, succeeding Patrick Disney, who was chairman of the board since 2019, having started SEI’s business in the UK.
Lawton has four decades of experience in financial services, regulatory and public sector positions and has worked at UK Financial Conduct Authority (FCA) and HM Treasury.
These board developments have been in effect since July 2025.
Seymour-Williams has a 30 year background of working in global investment, establishing businesses, composing finds and running distribution and client relationship groups.
She has served in senior leadership roles as a portfolio manager, chief investment officer, and CEO at firms such as Deutsche Asset Management and LGM Investments.
As a founding partner of Acorn Capital Advisers, Seymour-Williams advised families on manager selection and strategic asset allocation.
Lawton has an assortment of non-executive roles in the financial services and was formerly managing director and co-head of the UK regulatory advisory services practice at Alvarez & Marsal.
While at the FCA, he worked across markets and wholesale conduct policy and guided the FCA’s European and International strategy.
Seymour-Williams says: “SEI’s unwavering commitment to the UK, our clients, and workforce — coupled with current trends across wealth and investment management — present tremendous opportunity for growth. I am very excited to extend my involvement with the leadership team in this way, as we focus on building the UK business and supporting the vision and strategy of the company.”
Lawton adds: “I’m very pleased to join the SIEL board, as SEI’s industry position and breadth of capabilities create tremendous opportunity to help financial intermediaries and investors overcome the challenges of a dynamic financial services landscape. I look forward to working with Diane and the board members to help deliver impactful results and drive growth for our company, our clients, and our employees.”
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