Caroline joined TWI in 2025 following six successful years as Chief Executive Officer of The Chartered Institute of Building. Her experience of leading a professional institute built upon years of experience gained as the Chief Operating Officer at Make UK. She has also been Executive Director and International HR Director at EEF and Ransomes, accordingly. With expertise in both human resources and change management, allied with experience of leading within industry, Caroline has also been a Visiting Professor of Global Engagement and Transformation (Built Environment) at Loughborough University, and a Trustee Director of The Chartered Institute of Export and International Trade.
David Wrathmall
Executive Director
David Wrathmall is a graduate of University College London and a Chartered Management Accountant who has held c-level positions with broad operational remits over the last 16 years. He has worked across Europe and emerging markets, including with internationally listed companies in digital technologies, telecoms, financial services, and the research and education sectors. David has recent experience of delivering cross-border organisational restructuring programmes, including mergers and corporate restructuring, and served as Director on the main board of The Welding Institute from 2020 to 2023, whilst also chairing its Audit Committee. David was appointed as the interim Chief Executive of TWI from April 2024 to June 2025 and is currently providing transitional support to the organisation’s leadership.
Leonie Stewart
Director of Finance and Legal
Leonie joined TWI in 2019 as Business Transformation Project Manager, where she helped to implement a programme of change to prepare the business for future growth.
She has spent 26 years working in finance and operations, half of this time at Global FD and CFO level. She has worked in the USA, Middle East, Europe and Asia Pacific regions, predominantly with high growth companies in the financial markets and IT sectors. Leonie is a contributor and guest lecturer on the ‘Entrepreneurship for Physicists’ course at Imperial College, London.
Paul Woollin
Director of Research and Quality Assurance
Paul joined the Materials Department at TWI in 1992, earlier graduating and gaining a doctorate from the University of Cambridge. He specialises in the metallurgy, weldability and weld properties of stainless steels and nickel alloys. In 2000, he became Head of the Materials Department and was appointed Director of Research in 2010.