Law at the Nexus of Business and Technology
Strategic legal advice for the European digital economy
Law at the Nexus of Business and Technology
Strategic legal advice for the European digital economy
Law at the Nexus of Business and Technology
Strategic legal advice for the European digital economy
About Proust Legal
Proust Legal is an independent Brussels-based law firm dedicated to advising multinational corporations on the full spectrum of European digital regulation. Positioned at the nexus of business and technology, the firm combines deep legal expertise with strategic insight to help organizations navigate an increasingly complex regulatory landscape and achieve their business objectives across the European Union.
Drawing on more than two decades of experience advising international clients, Proust Legal provides pragmatic, commercially focused advice on data protection, cybersecurity, artificial intelligence and the rapidly evolving body of EU digital legislation. Based in Brussels, at the heart of European law-making, the firm helps clients turn regulatory complexity into a strategic advantage.
About Proust Legal
Proust Legal is an independent Brussels-based law firm dedicated to advising multinational corporations on the full spectrum of European digital regulation. Positioned at the nexus of business and technology, the firm combines deep legal expertise with strategic insight to help organizations navigate an increasingly complex regulatory landscape and achieve their business objectives across the European Union.
Drawing on more than two decades of experience advising international clients, Proust Legal provides pragmatic, commercially focused advice on data protection, cybersecurity, artificial intelligence and the rapidly evolving body of EU digital legislation. Based in Brussels, at the heart of European law-making, the firm helps clients turn regulatory complexity into a strategic advantage.
About Proust Legal
Proust Legal is an independent Brussels-based law firm dedicated to advising multinational corporations on the full spectrum of European digital regulation. Positioned at the nexus of business and technology, the firm combines deep legal expertise with strategic insight to help organizations navigate an increasingly complex regulatory landscape and achieve their business objectives across the European Union.
Drawing on more than two decades of experience advising international clients, Proust Legal provides pragmatic, commercially focused advice on data protection, cybersecurity, artificial intelligence and the rapidly evolving body of EU digital legislation. Based in Brussels, at the heart of European law-making, the firm helps clients turn regulatory complexity into a strategic advantage.
Practice Areas
Proust Legal advises multinational corporations across the full spectrum of European digital regulation. Combining EU-wide expertise with in-depth knowledge of French domestic law, the firm provides strategic legal advice on the regulatory issues shaping today’s digital economy.
01
Privacy & Data Protection
Proust Legal advises organizations on the responsible collection, use, sharing and protection of personal data. The firm helps clients design privacy programmes, comply with European and French data protection laws, and build governance frameworks that support innovation while safeguarding individuals’ rights.
02
Cybersecurity
Cybersecurity has become a strategic and regulatory priority for organizations operating in Europe. Proust Legal advises clients on cybersecurity governance, cyber resilience, incident response and regulatory compliance, helping businesses manage cyber risk and respond effectively to security incidents.
03
Artificial Intelligence
Artificial intelligence is transforming every sector of the economy while creating new legal and governance challenges. Proust Legal helps organizations develop, deploy and govern AI systems responsibly, ensuring compliance with Europe’s evolving AI regulatory framework while enabling innovation and business growth.
04
Data Economy
Data has become one of the world’s most valuable business assets. Proust Legal advises organizations on the legal frameworks governing access to, sharing and use of data, helping clients unlock the value of data while complying with the European Union’s new generation of data legislation.
05
Digital Business
Digital technologies are reshaping the way businesses interact with customers, platforms and markets. Proust Legal advises companies on the legal framework governing digital services, online platforms, e-commerce and other aspects of the digital economy, enabling clients to operate confidently in an increasingly regulated environment.
Practice Areas
Proust Legal advises multinational corporations across the full spectrum of European digital regulation. Combining EU-wide expertise with in-depth knowledge of French domestic law, the firm provides strategic legal advice on the regulatory issues shaping today’s digital economy.
01
Privacy & Data Protection
Proust Legal advises organizations on the responsible collection, use, sharing and protection of personal data. The firm helps clients design privacy programmes, comply with European and French data protection laws, and build governance frameworks that support innovation while safeguarding individuals’ rights.
02
Cybersecurity
Cybersecurity has become a strategic and regulatory priority for organizations operating in Europe. Proust Legal advises clients on cybersecurity governance, cyber resilience, incident response and regulatory compliance, helping businesses manage cyber risk and respond effectively to security incidents.
03
Artificial Intelligence
Artificial intelligence is transforming every sector of the economy while creating new legal and governance challenges. Proust Legal helps organizations develop, deploy and govern AI systems responsibly, ensuring compliance with Europe’s evolving AI regulatory framework while enabling innovation and business growth.
04
Data Economy
Data has become one of the world’s most valuable business assets. Proust Legal advises organizations on the legal frameworks governing access to, sharing and use of data, helping clients unlock the value of data while complying with the European Union’s new generation of data legislation.
05
Digital Business
Digital technologies are reshaping the way businesses interact with customers, platforms and markets. Proust Legal advises companies on the legal framework governing digital services, online platforms, e-commerce and other aspects of the digital economy, enabling clients to operate confidently in an increasingly regulated environment.
Practice Areas
Proust Legal advises multinational corporations across the full spectrum of European digital regulation. Combining EU-wide expertise with in-depth knowledge of French domestic law, the firm provides strategic legal advice on the regulatory issues shaping today’s digital economy.
01
Privacy & Data Protection
Proust Legal advises organizations on the responsible collection, use, sharing and protection of personal data. The firm helps clients design privacy programmes, comply with European and French data protection laws, and build governance frameworks that support innovation while safeguarding individuals’ rights.
02
Cybersecurity
Cybersecurity has become a strategic and regulatory priority for organizations operating in Europe. Proust Legal advises clients on cybersecurity governance, cyber resilience, incident response and regulatory compliance, helping businesses manage cyber risk and respond effectively to security incidents.
03
Artificial Intelligence
Artificial intelligence is transforming every sector of the economy while creating new legal and governance challenges. Proust Legal helps organizations develop, deploy and govern AI systems responsibly, ensuring compliance with Europe’s evolving AI regulatory framework while enabling innovation and business growth.
04
Data Economy
Data has become one of the world’s most valuable business assets. Proust Legal advises organizations on the legal frameworks governing access to, sharing and use of data, helping clients unlock the value of data while complying with the European Union’s new generation of data legislation.
05
Digital Business
Digital technologies are reshaping the way businesses interact with customers, platforms and markets. Proust Legal advises companies on the legal framework governing digital services, online platforms, e-commerce and other aspects of the digital economy, enabling clients to operate confidently in an increasingly regulated environment.
Legal Services
Proust Legal provides focused legal support to organisations navigating complex European digital regulation, from ongoing compliance and regulatory strategy to investigations, incidents and emerging technologies.
001
External Data Protection Officer
Independent DPO services supporting organisations in the implementation and day-to-day management of their data protection compliance programmes. Proust Legal acts as an external Data Protection Officer for companies across a range of sectors, providing pragmatic, business-focused advice while serving as a trusted point of contact for regulators and data subjects.
002
Regulatory Investigations & Enforcement
Independent DPO services supporting organisations in the implementation and day-to-day management of their data protection compliance programmes. Proust Legal acts as an external Data Protection Officer for companies across a range of sectors, providing pragmatic, business-focused advice while serving as a trusted point of contact for regulators and data subjects.
003
International Data Transfers
Advising multinational organisations on the lawful transfer of personal data across borders. The firm has extensive experience with Standard Contractual Clauses (SCCs), Transfer Impact Assessments (TIAs), Binding Corporate Rules (BCRs) and complex international data transfer strategies.
004
Incident Response & Crisis Management
Supporting organisations in responding to data breaches, cybersecurity incidents and other regulatory crises. Proust Legal advises on notification obligations, regulatory engagement, crisis coordination and the management of data subject requests during high-pressure situations.
005
Incident Response & Crisis Management
Helping organisations assess the legal and regulatory implications of developing, procuring and deploying artificial intelligence systems. Proust Legal supports clients in identifying AI-related legal risks, implementing governance frameworks and preparing for compliance with the EU AI Act.
006
Executive Training & Workshops
Delivering tailored training programmes for boards, senior executives and operational teams on GDPR, cybersecurity, artificial intelligence and European digital regulation. Sessions are designed to translate complex legal requirements into practical business guidance.
007
Flexible Legal Secondments
Providing experienced in-house legal support on a temporary or project basis. Whether supplementing internal legal teams or covering periods of increased workload, Proust Legal offers flexible secondment solutions tailored to clients’ operational needs.
008
Digital Regulatory Strategy
Advising senior management on the strategic implications of European digital regulation. From product development and digital transformation initiatives to AI governance and regulatory readiness, Proust Legal helps organisations integrate legal strategy into business decision-making.
How We Work
Pragmatic Personal Strategic
Legal advice should enable business, not slow it down. At Proust Legal, every assignment begins with a simple objective: understanding your business before advising on the law. Taking the time to understand your products, services, commercial objectives and risk appetite allows legal advice to be practical, proportionate and aligned with the realities of your organisation.
There are no one-size-fits-all solutions. Every matter receives personal attention and every recommendation is tailored to the client’s specific circumstances. Proust Legal acts as a trusted strategic advisor, helping organisations navigate regulatory complexity while supporting innovation, digital transformation and business growth.
Clients value clear communication, practical solutions and advice that is both legally robust and commercially sound. Proust Legal combines legal excellence with strategic judgment to help organisations make confident business decisions in a complex regulatory environment.
Transparent Pricing
Legal fees should be as predictable as the advice itself. Proust Legal offers flexible fee arrangements designed to provide transparency and align with each client’s needs.
Fixed-Fee Projects
Wherever possible, project-based work is undertaken on a fixed-fee basis, allowing clients to define budgets with confidence and avoid unexpected costs.
Monthly Retainers
For clients requiring ongoing support, the firm offers monthly retainer arrangements that provide continuous access to legal advice and strategic guidance.
Hourly Billing
In certain situations—particularly urgent regulatory matters, investigations or incident response—billing on an hourly basis may be the most appropriate model.
In every case, fees are discussed openly at the outset so that clients have complete clarity on the scope of work and expected costs.
Biography
Olivier Proust is the Founder and Managing Partner of Proust Legal, an independent Brussels-based law firm advising multinational corporations on European digital regulation.
For more than twenty years, Olivier has advised leading international companies on the legal and regulatory challenges arising from data protection, cybersecurity, artificial intelligence and digital technologies. His practice focuses on helping businesses navigate Europe’s rapidly evolving digital regulatory framework while supporting innovation, international growth and the responsible adoption of emerging technologies.
Before founding Proust Legal, Olivier practised in several leading international law firms, culminating in his appointment as partner at an international law firm. Throughout his career, he has advised clients across a broad range of industries on complex cross-border regulatory matters, major cybersecurity incidents, international data transfers, AI governance and strategic compliance programmes.
Olivier is admitted to the Brussels and Paris Bars. He obtained his law degree from Université Panthéon-Assas (Paris II), before completing a Master of Laws (LL.M.) at the University of Toronto and a second master’s degree in technology law at the Université Robert Schuman in Strasbourg. He also holds an Executive Diploma in Artificial Intelligence for Business from the Saïd Business School, University of Oxford, where he lectures on the EU AI Act and the legal implications of artificial intelligence for business leaders.
His expertise has been consistently recognised by Chambers and Partners and Legal 500, which rank him among the leading practitioners in Europe for data protection, cybersecurity and technology law.
Clients value Olivier for his ability to combine technical legal expertise with commercial judgment, delivering clear, pragmatic advice that enables organisations to manage regulatory risk while pursuing their strategic objectives. He is a trusted advisor to senior executives, legal and compliance teams, and data protection officers on some of the most complex issues at the intersection of business, technology and regulation.
Values
Three principles underpin every client relationship at Proust Legal.
Trust
Long-term relationships are built on confidence. Clients entrust Proust Legal with some of their most sensitive legal, regulatory and commercial challenges, knowing that their interests will always come first.
Honesty
Clear, candid advice is fundamental to effective decision-making. Clients receive straightforward legal guidance that identifies both risks and opportunities, even when the message may be difficult to deliver.
Integrity
Professional independence and ethical conduct are non-negotiable. Proust Legal is committed to acting with integrity in every engagement, providing objective advice and maintaining the highest standards of professionalism and confidentiality.
In every case, fees are discussed openly at the outset so that clients have complete clarity on the scope of work and expected costs.
Credentials
Recognition from leading international legal directories and clients across Europe.
“Olivier Proust excels with superior knowledge on EU Binding Corporate rules and regulator practices in this context.”
Legal 500
“Olivier Proust stands out for his exceptional legal acumen in the field of artificial intelligence, along with his genuine dedication to clients and team. Proust provides deep expertise on the EU AI Act and the surrounding ecosystem of national authorities regulating AI in Europe.”
Legal 500
“Pragmatic and accurate advice, high subject-matter expertise leveraging a lot of experience with regulator interactions.”
Legal 500
“His diligence and knowledge are just amazing. He anticipates trouble from the regulators and suggests really good approaches. He is a pragmatic, business-minded and reasonable lawyer.”
Chambers Europe
“Olivier Proust is excellent and a trustworthy ally for our business.”
Chambers Europe
“Olivier Proust has continuously delivered excellent products.”
Chambers Europe
“What sets him apart is his combination of legal precision and business pragmatism. He consistently delivers advice that is not only technically sound but also tailored to the realities of our operations.”
Chambers Europe
“His responsiveness, clarity of communication and ability to navigate complex privacy matters with confidence make him a standout adviser.”
Chambers Europe