CMS offers a comprehensive privacy and data protection practice, spanning GDPR compliance, supervisory authority investigations, data breaches, cybersecurity incidents, and complex data transfer projects, while advising clients on the implications of new EU digital legislation. The team also boasts a fast-growing cybersecurity capability and provides pan-European support. Practice head Tom De Cordier is a seasoned technology lawyer with extensive data and IT expertise, while Thomas Dubuisson and Deven Dobbelaere bring strong specialisms in data protection, cybersecurity, AI and broader digital regulation.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘The team goes further than purely advisory: the team is capable of litigation, representing clients before DPAs, courts. Also strong in incident response (cybersecurity breaches, data security incidents). This allows the same team to guide clients before, during and after issues arise, ensuring consistency of strategy, knowledge of risk, and ability to act quickly in crises.'
- ‘Tom De Cordier distinguishes himself through a combination of legal depth, commercial pragmatism, and cross-border perspective. While many practitioners focus narrowly on compliance, Tom has built a practice that not only navigates complex regulations like the GDPR and e-privacy laws but also anticipates how they intersect with technology, litigation, and business strategy. He is also very approachable and very responsive, and a strategic partner in cyber-incident crisis.'
- ‘The team champions a culture of continuous improvement—regularly updating guidance to reflect the latest regulatory developments, integrating cutting‑edge privacy‑tech tools, and fostering cross‑functional collaboration that accelerates delivery without sacrificing rigour. Their commitment to transparency, proactive communication, and client‑centric tailoring ensures that every engagement feels personalised yet reliably consistent, setting a benchmark for excellence in privacy and data‑protection services.’
- ‘Tom De Cordier is exceptionally knowledgeable and articulate. He’s an ideal partner for brainstorming and sparring on risk scenarios, pragmatic responses to bureaucracy, and overly prescriptive legislation. Tom is consistently available, responsive, and serves as an outstanding trainer on data protection, e‑privacy, and cybersecurity.'
- ‘Friendly approach and great articulation, without dropping any detail.’
- ‘Tom De Cordier is always able to articulate at the right level, and with a pragmatic viewpoint.’
Key clients
- Yondr
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Leading associates
Leading associates with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Thomas Dubuisson
Practice head
Tom De Cordier
Other key lawyers
Thomas Dubuisson; Deven Dobbelaere