SEI Investments (Europe) Limited Makes Two Key Board Appointments

LONDON, 13 Aug. 2025 – SEI^® (NASDAQ: SEIC) today announced that Diane Seymour-Williams has been appointed as Board Chair of SEI Investments (Europe) Limited (SIEL), and David Lawton has been appointed as an Independent Non-Executive Director. Seymour-Williams joined SIEL’s board in 2019 and steps into the Chair role following the retirement of Patrick Disney, who served as Chairman of the Board since 2019 and was the former head of SEI’s Institutional business in the EMEA region and responsible for launching SEI’s business in the UK. Board changes were effective in July 2025. 

Seymour-Williams brings three decades of global investment experience, building businesses, structuring funds, and leading distribution and client relationship teams. She has held senior leadership roles as a portfolio manager, CIO, and CEO at firms that include Deutsche Asset Management and LGM Investments. Seymour-Williams was also a founding partner of Acorn Capital Advisers, focused on advising families and family offices on manager selection and strategic asset allocation. She has chaired various investment, risk, and ESG committees and is a pro-bono member of the Investment Committees of Newnham College, Cambridge, and the Canal & River Trust.

Commenting on her appointment as Board Chair, Seymour-Williams said: 

“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.   

“On behalf of the SIEL Board, I want to thank Patrick for his many contributions to SEI’s business, clients, and shareholders over the last 26 years. SEI’s success is a testament to his leadership and dedication, and his impact will endure for years to come.” 

Lawton brings 40 years of experience in financial services, regulatory, and public sector positions, including at the FCA and HM Treasury, and currently has a portfolio of non-executive roles across the financial services sector. He was previously Managing Director and Co-Head of the UK regulatory advisory services practice at Alvarez & Marsal. At the FCA, he was most recently responsible for markets and wholesale conduct policy, as well as leading the FCA’s European and International strategy, chairing several prominent international committees and representing the FCA at the European Securities and Markets Authority Board of Supervisors.

Commenting on his appointment, Lawton said: 

“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.”

Disney added: 

“Diane and David bring extensive expertise to their board positions, and these appointments underscore SEI’s dedication to evolving its leadership with diverse perspectives and experience. They will be instrumental in supporting SEI’s continued growth and innovation.  

“It has been an honour and a privilege to serve as Chairman of the Board and work alongside leadership to help drive the strategic direction of the business. I’m incredibly grateful to be a part of SEI’s history and look forward to cheering the team on to future success.”

About SEI^®

SEI (NASDAQ:SEIC) is a leading global provider of financial technology, operations, and asset management services within the financial services industry. SEI tailors its solutions and services to help clients more effectively deploy their capital—whether that’s money, time, or talent—so they can better serve their clients and achieve their growth objectives. As of June 30, 2025, SEI manages, advises, or administers approximately $1.7 trillion in assets. For more information, visit seic.com.