Firm Profile > J A Kemp > London, England

J A Kemp

PATMA: Patent attorneys Tier 1

J A Kemp fields a highly international caseload, offering an experienced patent application drafting and filing practice and a strong EPO opposition and appeals team to its prestigious list of domestic and international clients, including a high number of US and Japanese clients. It has also expanded its presence in the Chinese and South Korean markets. Able to assist with a wide range of patents, the team demonstrates particular strength in patent restoration work and SPCs. Clients include start-ups and spin-outs, major global players and renowned research institutions. The arrival of Ian MacLeod from Carpmaels & Ransford LLP in January 2020 bolstered the biotechnology and life sciences bench, led by Patrick Campbell. The engineering and IT practice is headed by Nigel PriceCelia Keen heads the chemistry and pharmaceutical practice; and Ravi Srinivasan leads the pharmaceutical team. Head of medical devices Mark Roberts, head of software John Leeming and head of electronics Samuel Smith are also key practitioners.

Other key lawyers:


‘Mark Roberts has been producing excellent work, demonstrating great understanding of surgical instruments and techniques but also an ability to keep within strict NHS budgetary constraints.’

‘John Leeming is an eminent patent attorney well versed in European computer-implemented inventions practices. He is also knowledgeable about software technology, including cutting-edge technologies such as AI. He offers us excellent services in terms of both technological and legal expertise.’

‘With the vital support of JA Kemp’s outstanding team, we have had remarkable success in securing effective protection for a downstream innovation around the world.’

‘Ravi Srinivasan is an outstanding IP legal professional. His insights and attention to detail are second to none. He and his team are efficient, organised and highly effective. I have no hesitation in recommending him to others.’

Key clients




Lockheed Martin

Oxford University


Toyota Motor Corporation

University of California

PATMA: Trade mark attorneys Tier 1

J A Kemp specialises in strategic, high-stakes trade mark work for clients from the UK, the EU (especially Scandinavia, France and Spain), and further abroad, with US and Japanese clients accounting for a particularly significant number of instructions. Adept at assisting start-ups, global corporations, SMEs and renowned academic institutions alike, both in contentious and non-contentious matters, the firm offers combined trade mark attorney, patent attorney and solicitor services from its UK offices in London, Oxford and Cambridge, and its offices in Paris and Munich. Another standout feature is the dedicated designs practice, led by Tom Albertini. James Fish directs the trade marks practice. Both attorneys are based in London.

Practice head(s):


‘Totally professional. Good systems in place.’

‘They understand the client’s goals and provide very pragmatic, commercially focused advice to help reach those goals.’

‘Strong, strategic and practical advice on the legal aspects of trade marks as well as an efficient registration/renewal process.’

‘Charlotte Stirling is responsive, knowledgeable and personable in equal measure.’

‘We have had dealings with J A Kemp over a long period of time. What makes them an outstanding partner is the quality of their people and of the advice they provide. They are always happy to work with you swiftly to rule in or out new concepts and thus minimise wasting money. And once we proceed with a project the service is always first class.’

‘James Fish is a tremendously talented individual as well as having an extremely open and warm disposition. He is always available to chat, responds swiftly, and his advice is clear and to the point, which is exactly how we like it.’

Key clients

ADIDAS International Marketing (and their related companies ADIDAS-Salomon and Reebok)

GW Pharma

Hunter Douglas Industries

J K Rowling

JP Morgan & Chase

Mitsubishi Electric


Seiko Corporation

The Hershey Corporation

The Royal British Legion

Toyota Motor Corporation

 J A Kemp is one of the largest European patent and trade mark attorney firms, with offices in London, Oxford, Cambridge, Paris and Munich.

The firm prides itself on a pragmatic and strategic approach across all practice areas, supporting its clients’ changing needs at every stage of a project. Drafting; prosecution; opposition and litigation; non-contentious transactions and agreements; searching and assessment of validity / FTO; as well as global portfolio management:  all are handled in-house with the utmost professionalism and attention to detail. J A Kemp attorneys routinely leverage their expertise and experience to propose creative solutions to complex problems in all areas – helping their clients’ businesses to grow.

The firm works for a huge variety of direct domestic (UK and European) and international clients, ranging from startups, spinouts and growing businesses, through to some of the largest corporations and most prestigious academic institutions in the world. Attorney firms in the USA, Japan, China and the Republic of Korea also routinely instruct J A Kemp on behalf of their clients, happy to rely upon the firm’s unparalleled ability to secure intellectual property protection within Europe and elsewhere.

J A Kemp’s patents team is rightly famed for the breadth and depth of its technical expertise in every area of science and technology, boasting over 80 science and technology graduates, including over 45 PhDs. Drawing from three broad client service groups: biotechnology and life sciences, chemistry and pharmaceuticals, and engineering and IT, the firm is adept at assembling cross-disciplinary teams able to handle even complex inventions which sit across technological boundaries. Areas of particular expertise include antibodies and biologics, bioinformatics, chemistry, cleantech, diagnostics and personalised medicine, electronics and electrical technology, engineering, IT and software, manufacturing, materials and metallurgy, medical devices and technology, optics, pharmaceuticals, plant science and agriculture, polymers, regenerative medicine, semiconductors, vaccines and immunology.  J A Kemp has a well-deserved reputation for excellence in patent oppositions and appeals before the European Patent Office, as well as in its specialist team handling supplementary protection certificates (SPCs) across Europe.

The senior professionals leading J A Kemp’s dedicated trade marks team are drawn from major international law firms. The team has the expertise and resources to handle any trade mark matter, with particular expertise in the registration of unusual or otherwise difficult marks, including shape marks and marks that require evidence of acquired distinctiveness. J A Kemp’s trade mark attorneys are experienced in dispute resolution and opposition and related enforcement issues. The firm also offers a range of specialist services to protect clients’ brands online, including domain name monitoring, portfolio rationalisation, domain name disputes, anti-phishing and impersonation, website and social media takedowns, as well as handling all aspects of design protection in the UK, Europe and the rest of the world.

J A Kemp provides support for contentious intellectual property matters in the High Court of England and Wales, the Intellectual Property Enterprise Court, the UK Intellectual Property Office, the European Patent Office and European Union Intellectual Property Office (EUIPO), plus their respective appeal courts. The IP Litigation and Dispute Resolution Support Group combines in-depth knowledge of patents, trade marks and designs. The Group consists of qualified solicitors, patent and trade mark attorney litigators who provide support services in order to achieve successful outcomes for the firm’s clients.

J A Kemp is a client-focused and commercially aware firm with the breadth and depth of expertise to handle any intellectual property matter.

Department Name Email Telephone
Chair of the management committee John Leeming
Chief operating officer Philip Hall
Biotechnology and life sciences Patrick Campbell
Chemistry and pharmaceuticals Celia Keen
Engineering and IT Nigel Price
Trade marks and designs James Fish
Medical devices Mark Roberts
Electronics Samuel Smith
Pharmaceuticals Ravi Srinivasan
Photo Name Position Profile
 Tom Albertini  photo Tom Albertini Partner, European and UK Chartered Trade Mark Attorney, Litigator
 Lucy Barnes  photo Lucy Barnes Partner, European and UK Patent Attorney
 Patrick Campbell  photo Patrick Campbell Partner, European and UK Patent Attorney
Dr Andrew Clark  photo Dr Andrew Clark Partner, European and UK Patent Attorney
Dr Anthony Duckett  photo Dr Anthony Duckett Partner, European and UK Patent Attorney
 James Fish  photo James Fish Partner, European and UK Chartered Trade Mark Attorney, Solicitor
 Kieron Grehan  photo Kieron Grehan Partner, European and UK Patent Attorney
 Toby Hopkin  photo Toby Hopkin Partner, European and UK Patent Attorney
Dr Henry Hunt-Grubbe  photo Dr Henry Hunt-Grubbe Partner, European and UK Patent Attorney
Dr Martin Jackson  photo Dr Martin Jackson Partner, European and UK Patent Attorney, Litigator
 Celia Keen  photo Celia Keen Partner, European and UK Patent Attorney  
 Tom Leanse  photo Tom Leanse Partner, European and UK Patent Attorney
 John Leeming  photo John Leeming Partner, European and UK Patent Attorney, Litigator  
Dr Graham Lewis  photo Dr Graham Lewis Partner, European and UK Patent Attorney  
Dr Ian MacLeod  photo Dr Ian MacLeod Partner, European and UK Patent Attorney  
 James Main  photo James Main Partner, Patent Attorney
 Chris Milton  photo Chris Milton Partner, Patent Attorney
 Aaron Newell  photo Aaron Newell Partner, Solicitor
Dr David Power  photo Dr David Power Partner, Patent Attorney
 Nigel Price  photo Nigel Price Partner, Patent Attorney
Dr Stuart Raynor  photo Dr Stuart Raynor Partner, Patent Attorney
Dr Joanne Roberts  photo Dr Joanne Roberts Partner, Patent Attorney
 Mark Roberts  photo Mark Roberts Partner, Patent Attorney
 Sarah Roques  photo Sarah Roques Partner, Patent Attorney
 Samuel Smith  photo Samuel Smith Partner, Patent Attorney
 Ravi Srinivasan  photo Ravi Srinivasan Partner, Patent Attorney, Litigator
 Charlotte Stirling  photo Charlotte Stirling Partner, European Trade Mark Attorney
 Hermione Thompson  photo Hermione Thompson Partner, European and UK Patent Attorney
 Simon Wright  photo Simon Wright Partner, Patent Attorney
Number of partners : 44
Number of other fee-earners : 62
Total staff : 220