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Press Release

Grant Thornton UK welcomes new members to its Board

29 Aug 2025 7 min read
  • Stuart Quickenden to Chair the Board at Grant Thornton UK 
  • Interim Chair Imogen Joss remains on the Board as an Independent Non-Executive (INE) alongside fellow INE Andrew Silverbeck 
  • Announcement comes four months after the firm completed its landmark transaction with international private equity firm Cinven and looks to continue its record growth with the ambition of achieving £1 billion revenues in the coming years  

Grant Thornton UK is pleased to announce that Stuart Quickenden has been appointed Chair of the firm’s Board. Previously Managing Partner for the UK, Ireland, Netherlands, and Belgium at The Boston Consulting Group (BCG), Stuart takes over from interim Chair, Imogen Joss, who remains on the Board as an Independent Non-Executive (INE) alongside fellow INE Andrew Silverbeck, former CFO at Environmental Resources Management (ERM). The primary purpose of the board is to provide oversight of and strategic guidance to the strategic leadership team. 

Malcolm Gomersall, Chief Executive at Grant Thornton UK LLP, commented: “I’d like to extend my sincere thanks to Imogen for her outstanding leadership and commitment during her time as interim Chair of Grant Thornton UK's Board and her earlier service as Chair of the firm’s former Partnership Governance Board. Imogen brought a thoughtful and rigorous approach to the role, offering both challenge and support in equal measure. As INEs, the perspectives that Imogen and Andrew bring to the firm strengthen the Board’s breadth and depth as we move forward. We are also delighted to welcome Stuart Quickenden as our new Chair, whose strategic insight and experience will be invaluable as we continue to grow and evolve.”  

The announcement comes as Grant Thornton continues to accelerate its growth, following its landmark decision to take external investment from international private equity firm Cinven, which will see the firm invest significantly in its people and technologies over the coming years. This year, the firm has already appointed 32 new partners (the majority of which are internal), promoted more than 600 employees and is set to welcome over 260 graduates and school leavers next month. 
 
Stuart Quickenden stated: "Having spent most of my career in client and leadership roles in professional services, I'm delighted to join the Board of Grant Thornton at such an exciting time, as the firm accelerates its growth with external investment. I look forward to working with Cinven, the Board, the GT Partners and the whole Grant Thornton UK team." 

Biographies:   

  • Stuart Quickenden: Stuart has over 25 years of consulting experience, holding significant leadership roles at The Boston Consulting Group (BCG), including Chair for the UK and Ireland; Managing Partner for the UK, Ireland, Netherlands, and Belgium; and a member of BCG's Global Executive Committee. His client expertise spans strategy, operations, restructuring and transformation across various industries, particularly in financial services and retail. Stuart is also a board member at Octopus Group, where he Chairs Octopus Investments and Octopus Money, supporting the Octopus team in driving their mission to foster businesses that positively impact society. Additionally, he served as a non-executive board member for the UK Department for Business, Energy, and Industrial Strategy. 
  • Imogen Joss, BEM: Imogen brings 30 years of global experience in the fintech sector to the firm. She currently serves on the boards of several organisations, including SThree plc as a Non-Executive Director, Envetec Ltd as Chair and Non-Executive Director, and XPS Pensions plc as Senior Independent Director and Chair. Her areas of expertise encompass remuneration, ESG, and a strong focus on people and clients, complemented by a robust commercial background. Additionally, Imogen is the Chair of Trustees for a charity dedicated to alleviating rural child poverty in the UK, where her team provides essential support in education, healthcare, and social services. In recognition of her commitment to the local community, Imogen was awarded the British Empire Medal (BEM) in 2023.  
  • Andrew Silverbeck: Andrew originally qualified as a Chartered Accountant at Arthur Andersen and then held CFO positions in the listed sector at Bovis Lend Lease, and in the private equity-backed sector at Environmental Resources Management and Rubix. His career has been focused on helping people-based organisations grow strongly and sustainably while maintaining their inherent cultures. 

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