Guillaume Seligmann is a partner in the firm’s Paris office and leads its French technology, privacy, and data protection practice. His practice focuses on all aspects of technology, advising clients on a broad range of technology transactions, disputes, and regulatory matters, both within France and internationally. He counsels clients on software licensing and disputes, outsourcing, cloud computing, data privacy, cybersecurity, big data, digital media, and other e-commerce and internet-related issues. He also has substantial experience advising on matters related to telecom networks, VoIP, and satellite telecommunications as well as technology pertaining to the defense, aerospace, and robotics industries.
Guillaume’s practice has been recognized by Legal 500 France in the IT, Telecoms, and Internet category, by Chambers Europe in the Information Technology category, and by The Best Lawyers in France in the Privacy and Data Security Law category. He also lectures at HEC / Ecole 42 for its Masters in Management program.
Prior to joining the firm, Guillaume was a partner at Cotty Vivant Marchisio & Lauzeral in Paris. He received his Master’s Degree in Business Law from the University of Paris I – Panthéon Sorbonne and his LL.B. with honors from King’s College London at the University of London. Guillaume is fluent in French and English.
Guillaume Seligmann is a partner in the firm’s Paris office and leads its French technology, privacy, and data protection practice. His practice focuses on…
Anglo-French Joint Legal Studies Program, University of Paris I - Panthéon Sorbonne (LL.M. Business Law); King’s College London, University of London (LL.B. with honours).
Activities and Affiliations
Associated Partner, Association Française des Editeurs de Logiciels
Member, French Chapter of the Cloud Security Alliance
Member, Association des Juristes de Paris I – King’s College London
Johannes Jonas and Guillaume Seligmann were recognized in The Best Lawyers in France’s 2020 listing – Johannes for Corporate Law and Guillaume for Privacy and Data Security Law. Lawyers named to The Best Lawyers in France were recognized by their peers in the legal industry for their professional excellence in their respective practice areas.
Guillaume Seligmann, a partner in Cohen & Gresser's Paris office, has been recognized by Chambers & Partners in its recently released 2019 Europe guide as a leading practitioner in the Information Technology field in France. Chambers’ commentary noted that Guillaume has “true knowledge of IT,” that “he knows the underlying technology very well” and that Guillaume handles domestic and international technology matters, including licensing, e-commerce, cloud services, as well as IT disputes.
Guillaume Seligmann, a partner in Cohen & Gresser's Paris office, has been recognized by Chambers & Partners in its 2018 Europe guide as a leading practitioner in the Information Technology field in France. Chambers notes that market sources and clients commented that Guillaume “really understands business and technology, as well as strategy issues” and offers "imaginative and adapted legal or contractual responses to such challenges.”
Dalenys, a fintech company based in France, was recently sold to Natixis for 160 million EUR. Cohen & Gresser's Paris team advised Dalenys throughout the transaction. The following French news outlets covered the story:
The firm’s French M&A practice has been recognized by Chambers & Partners in its recently released 2017 Europe guide in the Corporate/M&A: Mid-Market category. Chambers Europe also ranked Paris partner Guillaume Seligmann for TMT: Information Technology in France. Chambers' client commentary described Guillaume as "insightful, competent and efficient.”
Paris Partner Guillaume Seligmann has been ranked by Chambers & Partners in its recently released 2016 Europe guide for TMT: Information Technology in France. Chambers' commentary noted, "Technology partner Guillaume Seligmann of Cohen & Gresser handles IT contract negotiations, software licensing and disputes. Clients value his practical business-focused advice."
We are pleased to announce that Cohen & Gresser's Paris office has been recognized in Legal 500's 2016 France guide for its work in three separate practice areas: Mergers and Acquisitions; Employment; and IT, Telecoms, and the Internet. Legal 500 also noted Cohen & Gresser's growth in Paris over the course of 2015 in its overview of the French legal market.
Legal 500 analyzes the capabilities of law firms across the world. Its rankings highlight "practice area teams who are providing the most cutting edge and innovative advice to corporate counsel."
Cohen & Gresser is pleased to announce the expansion of the firm's technology practice, as partner Guillaume Seligmann and associate Marie Gagey have joined our Paris office. Mr. Seligmann will head the firm's French technology, privacy, and data protection practice. He was previously a partner at Paris firm Cotty Vivant Marchisio & Lauzeral and has been recognized by Legal 500 France and Chambers Europe.
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