Thomson Reuters names eight Keystone Law partners in its Stand-out Lawyers Guide 2026
Andrea James, Andrew Darwin & Anna McKibbin
“I've found Diederik/Keystone to be an invaluable part of our story, as a startup founder it's important to surround yourself with the best people that complement your weaknesses and can offer solutions. Diederik has a refreshing approach to startups and continues to add value across HR, legal and general business practices as legal counsel and non-exec director to KLEEK. I can not recommend Diederik enough and look forward to working with him for years to come.”
- Antoine Commane, Founder KLEEK
Diederik is a corporate dealmaker with deep cross-border M&A experience and a sharp instinct for what ambitious businesses need to move fast. He has led complex international transactions, group restructurings, and high-stakes financings spanning Europe, the US, and emerging markets, from sub-million acquisitions to multi-billion global deals.
Entrepreneurs, scale-ups, and multi-nationals alike rely on his clarity, commercial edge, and ability to anticipate the pressures that define modern corporate growth.
Alongside advising founders and boards, Diederik serves as a non-executive director for several international companies, bringing hands-on strategic insight to decision-making at the highest level.
Based between London and Brussels, he brings a global perspective to every deal and navigates international dynamics with ease.
Diederik advises corporates and investors on complex cross-border mergers, acquisitions and restructurings, coordinating multi-jurisdictional projects and managing transactional, regulatory and governance requirements for global businesses.
Experience
Diederik advises on private equity, venture capital and specialty lending transactions, including IPOs, funding structures and debt reorganisations.
Experience
Diederik advises on joint ventures, shareholder arrangements and international business structuring, including fractional ownership and complex commercial contracts.
Experience
Diederik advises German and international corporates, private equity investors and entrepreneurs on cross-border M&A, restructurings and investments, with extensive experience leading complex, multi-jurisdictional transactions between the UK, Germany and wider Europe.
Experience
Diederik advises multinational and African corporations on cross-border transactions, investments and restructurings, with experience leading major telecom, infrastructure and private investment projects across multiple African jurisdictions.
Experience
Please note: The experience list above may include examples of work completed prior to joining Keystone Law.
Diederik qualified as a solicitor in 2003. Prior to joining Keystone Law in 2015, he worked at the following firms: