Jonathan has a great deal of experience in the development and management of trade mark portfolios for a broad range of clients. He is also a regular speaker on trade mark issues in various contexts including for INTA and WIPO.

He helps set up and maintain commercially relevant opposition strategies for his clients. Handling oppositions and appeals across many jurisdictions forms a significant part of his practice. He has particular experience in resolving disputes by negotiating commercially practical agreements on behalf of his clients.

Jonathan has long-standing relationships with many of his clients. His commercial understanding of their businesses helps him deliver sophisticated and appropriate advice. Clients like his grounded approach and his clear focus on practical and workable solutions. As a result of his work for multinational clients, he is experienced in IP issues across diverse commercial sectors including finance, pharmaceutical, medical, power systems, fashion, retail and tobacco. He is active in many other commercial areas as well, not least due to his extensive collaborations with SMEs.

Jonathan has been a contributing author of all three editions of Wolters Kluwer’s Concise European Trademark and Design Law, writing the commentary on about 30 Articles of the EUTMR and the corresponding provisions of the CDR. This book was recently divided into separate volumes for trade marks and designs. He has also been the Editor of a new international title in The Law Reviews series called The Trademarks Law Review since its launch in 2017, now in its third edition.

  • Partner 1996
  • IPReg Board Member 2012-2019
  • Trade marks
  • Portfolio management
  • Contentious matters
  • Negotiations
  • MA Classics, Magdalene College, Cambridge
  • Registered Trade Mark Attorney 1992
  • Fellow of the Institute of Trade Mark Attorneys 2002

“Gold-ranked Jonathan Clegg comes highly praised for his ‘deep understanding of UK and EU trade mark law, and his ability to handle highly complex matters. He is appreciated for his prompt communication and sage, direct and practical guidance, which shows he understands his clientele and their commercial interest. Jonathan is well respected in the industry, having worked for many years with trainees, authorising trade mark manuals, and on various INTA committees’.”

World Trade Mark Review 1000, 2024

“Jonathan Clegg is a trade mark attorney relied upon by household-name and emerging brands to file and enforce their rights before registries, to support them in litigation and to advise on anti-counterfeiting programmes.”

Chambers and Partners, 2020

“Jonathan Clegg is the most knowledgeable attorney in EU law that I have had the privilege to work with.”

Client Testimonial (2018) in IP Stars

“Jonathan [Clegg] was named as a Trade Mark Star 2020 in Trade mark proceedings, Trade mark prosecution, and Trade mark strategy & counselling.”

IP Stars

“Trademark attorney of 30 years’ vintage Jonathan Clegg 'knows trademarks inside out.' Practical and strategic, he is the consummate trademark attorney. With the ability to handle a broad range of sophisticated prosecution, global portfolio management and complex opposition proceedings work in the United Kingdom and the European Union, he is unflappable in his demeanour and widely respected within the trademark community.”

World Trademark Review 1000

“Cleveland Scott York’s trademark team is well built, with abundant talent from top to bottom. Taking care of prosecution and portfolio management, it “maintains a high-level practice in terms of complex work” and presides over a growing contentious caseload, while also adding plenty of value through the educational initiatives it develops on behalf of clients. Assured leadership is provided by Lorna Hobbs and Jonathan Clegg, who between them have vast experience.”

World Trademark Review 2021

“Clegg sustains many long-term relationships with patrons, which has allowed him to cultivate advanced knowledge of their products, services and cultures; his trademark strategies are precision guided to meet business needs.”

WTR 2020 – Jonathan Clegg

“"Jonathan Clegg has a quick mind and is commercially astute. He is an excellent communicator, sensitive to the nuances of trade mark practice and procedure." "He is very pragmatic and a high technical skill level. He is pragmatic in coming up with solutions that are creative and incisive." "He is pragmatic and understands our business inside-out." ”

Chambers & Partners 2021
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