2026
"The team at M&C are experienced, energetic and to-the-point in their advice. I really like the way Daniel Sizer approaches new assignments. He has a practical and hands-on approach that sits well with the clients."
"Longstanding relationships with highly skilled, friendly and effective attorneys. Good ongoing communications, in particular a weekly 'check-in' meeting online to keep on top of issues and monitor deadlines."
"We have been very pleased with the quality of support provided by Marks & Clerk in relation to IP filing, prosecution, and administration. Their team offers clear, practical, and responsive guidance across a range of areas, including patents, software and copyright, and trade marks. We particularly value their ability to deliver high-quality drafting of applications that effectively support our research activities, commercialisation objectives, and publication strategies. Following priority application review and examination responses, they have also provided valuable guidance on data requirements to strengthen patent support, which has been highly beneficial to our ongoing IP strategy."
"Marks and Clerk create detailed and accurate applications for inventions. They're also very good at responding to and negotiating with examiners to overcome objections to novelty or the inventive step. What's more, they're good at keeping everything on file, filing on time, and managing the entire prosecution process without an issue."
"There is always someone who can help us with our needs, which often come out of left field. The team is very pleasant to work with and very responsive. They have handled some complex prosecution and opposition work for us, with great success."
"I can rely on the team to give me the information I need to form the right IP strategy. The team’s advisory service provides cost savings and benefits for future commercialisation."
Dan McGrath
"Dan focused on crucial points, by identifying criticalities and aspects requiring further details from our side. Background noise information that could pollute the analysis was filtered out. Last but not the least, Dan showed openness to consider costs as a critical aspect."
Noelle Pearson
"Marks & Clerk are very lucky to have Noelle Pearson onboard. The attention to detail, level of client relationship and broad knowledge surprises us every week in the best way. Noelle really has a great understanding of IP and trade marks, and takes time to ensure we also understand the terminology and next steps on a case-by-case basis."
Will Nieuwenhuys
"Will is always knowledgeable and helpful. He is very detailed-oriented and a great IP prosecutor."
Richard Gibbs
"Richard excels in providing technically informed and commercially relevant patent advice, particularly in the life sciences and biotechnology sectors. He combines deep scientific understanding with practical IP expertise to help clients protect and maximise the value of their innovations, drawing on his background as a research scientist and patent attorney. He is known for clear, thoughtful guidance on complex matters such as patent drafting, prosecution strategy, and due diligence, and is regularly recognised within the IP community for his strengths in life‑science patent work. He has helped us considerably through providing tailored IP training and support for our researchers."
Gavin Cullen
"Excellent applications, very good communication, accuracy, strategic management and responsiveness to examiners."
David Grant
"Deep technical knowledge, precise, excellent patent understanding."
2025
"Marks & Clerk attorneys consistently demonstrate strong technical skills and are in tune with policy developments and changes at the EPO."
"They provide very strong legal and technical advice and are very easy to work with."
"The attorneys we have chosen to use have a combination of good technical skills, law skills and communication skills. [They take a] clear and structured approach and prioritise our tasks if there is urgency or a short deadline. They are open and honest."
"Their efforts to understand the broader commercial strategy and where IP can support the business."
"The team are very professional and responsive and are able to give clear and technical advice on patent writing and making clear, accurate and acceptable claims."
"They are professional and proactive."
"They are knowledgeable about what will make a good application. The team has a good technical understanding and is able to take the ideas and concepts from us and write an application based on those ideas."
"I have no hesitation in saying M&C’s service towards clients is exceptionally good and consistent across different personnel."
"M&C have provided comprehensive, reasoned options and guidance on prosecution and litigation."
"I have had good experiences of working with M&C in written and oral proceedings."
"I am highly impressed with the level of service and support provided by the team. Their proactive approach, strong communication, and commitment to excellence set them apart.
"The firm’s high technical competence in both the semiconductor domain and patent law is a significant asset, and they excel at providing strategic, practical guidance. I appreciate their willingness to assist with urgent timelines without compromising the quality of their work."
"I am continuously impressed by the high quality of the work product I receive from Marks & Clerk. It is not always easy to find a firm that makes you feel like your work is important to them, but with Marks & Clerk, I am confident our projects are in good hands."
"They are efficient, available and dependable to get the work done."
"[They have] good knowledge regarding our technical area and, naturally, good understanding of relevant patent laws and practices."
"Excellent communication, personable, and clear explanations."
"[They have a] good understanding of prosecution tactics and [European patent] practice."
"[They are] very efficient and agile, with excellent knowledge."
"Great communication and uncomplicated cooperation. A very good lawyer-client relationship."
A client notes the firm's "integrity, honesty, speed and friendliness".
"Marks & Clerk are developing a deep bench of attorneys with particular expertise in the computer science and software space. As such, Marks & Clerk is a consistent, valued partner for servicing one of our primary clients. We can rely on Marks & Clerk to provide timely, high-quality work. The Marks & Clerk attorneys with whom we interact are very responsive and a pleasure to work with."
"They have a good understanding of the university sector and how we work with various parties, including inventors and licensees, and provide expert and appropriate support for this."
"They provide excellent service; they are punctual and give relevant advice – a firm to trust."
"Marks & Clerk is easy to work with and, most importantly, provides us with high-quality and timely advice on all matters in the European Patent Office. Their staff is truly exceptional and can be counted on to provide technically accurate and insightful advice for prosecuting and defending our clients' applications and patents in Europe."
"Marks & Clerk's team is nothing but excellent in every way. They are both technically and legally excellent. Every person on their team that we interact with consistently provides timely and valuable responses."
"We have one point of contact who manages all aspects for us. It keeps the process simple."
"Depth of knowledge and willingness to help across a range of specialisms. Always willing and approachable. We have never been disappointed with their service or value for money."
"For tough software cases I have confidence that they understand the technology and provide the best advice."
"Good know-how and less expensive than some competitors."
Robert Lind
"Robert Lind has incredible patience. Robert was very supportive throughout [the patent process] and not at all pushy."
Susan Bradley
"Susan Bradley has excellent technical understanding of our area of science and the mechanics of filing and prosecuting patents and always responds quickly with wise advice."
David Grant
"I have been working with David Grant from Marks & Clerk for a long time. I chose to work with him because of his strong technical skills, thorough work product, promptness in responding, and willingness to help even at short notice."
Andrea Williams
"I like working with Andrea Williams, who is a strong biotech attorney. I would look to work with Andrea at whatever firm she works at."
2023
"We appreciate the personal attention of the team and their efforts to understand our commercial goals and tailor their advice accordingly. "
"We feel that Marks & Clerk are part of our team: we have a long-term, trusted relationship with them and they understand our priorities."
"Marks & Clerk have an impressive range and depth of expertise, as well as relevant sector experience. Marks & Clerk have also provided fantastic support on IP education and training initiatives across our organisation."
"Marks & Clerk have notable knowledge and expertise in the field of patent prosecution and management of a patent portfolio. The team is resourceful, objective-driven and client-oriented."
"They are friendly, understanding, practical, pragmatic and highly professional. They maintain clear management of expectations, timelines and costs. "
"They are particularly helpful and responsive to any questions. I'm very happy with the advice they give and the quality of all their work."
"They are smart, timely and easy to work with."
"We appreciate the extremely solid dedication and high levels of client services, diving in and learning the underlying business and strategic issues at play."
"We appreciate the team's professionalism, attention to detail and timely manner of their services. They have a very good understanding of our business and the complexity of our industry and associated IP. Marks & Clerk has consistently provided excellent advice and support to our business and has helped develop and secure a substantial IP portfolio."
"We appreciate their high availability, honest advice, and great legal knowledge of the subject."
"We appreciate their strong technical expertise and good service. "
"They are all very approachable and friendly."
"They are very responsive, user-friendly and absolute experts in their field."
"They provide clear and practical advice, which makes it easier for the clients to make their decisions."
"We like their willingness to think and help the client, not just receive instructions, and their quick response."
"We value their in-depth knowledge of patent laws and technical expertise in the sciences."
"We value their understanding of technology. They always give good advice, never miss any deadline, and offer quick responsiveness."
"The professional relationship between us and the Marks & Clerk team has continued to evolve since the early days and remains strong. There is a high level of trust, and understanding of our business and technology, that is unbeatable. Our patent agent makes us feel like his only client, and that is an impressive achievement in his demanding line of work."
2022
"Marks & Clerk provides good commercial advice."
"They are proactive and reply swiftly."
"We have an excellent relationship with the firm. They understand the priorities of academic inventors and the university and provide pragmatic, cost-effective solutions whilst maintaining a high-quality service."
"Really helpful, supportive and flexible service which was invaluable in our complicated case."
"Clear and efficient communication."
"Punctual, quick and professional."
"Responsive, helpful and informative."
"The firm has a detailed understanding of our company's commercial focus."
"Their efforts to understand our commercial objectives and ensure that the IP advice is aligned with those objectives. They have also ensured that we have a clear succession plan with other members of the team being brought through on our patent cases."
"They excel in their knowledge and understanding of our product range."
"Marks & Clerk are always easily contactable and responsive to emails. They are also always happy to provide advice on both personal growth and business growth."
"They had initially done some work for my business as part of the start-up award we received. We were beyond pleased with their excitement about the technology, enthusiasm, level of service and the strategy advice they gave. We were very pleased to keep them onboard and since the start their standard of work has been at the highest level."
"At a start-up level, they offered additional support to our business to ensure they built a strong and positive relationship from the start. The quality of work has exceeded our company's expectations, and the effort they put into the work and the relationship is outstanding."
"We trust the advice given and we are very happy with the levels of service provided."
"Approachable, efficient, and trustworthy."
"We have a good working relationship with their attorneys and have a high level of trust in their work."
"We like the practical approach and the availability of advisers with appropriate background."
"We have been using them for patent filing work in the UK for a few years and are satisfied with their service, in particular the technical know-how in the power semiconductors field."
"Good relationship, prompt communication and responses, well-drafted filings, and useful advice."
"Their culture is compatible and they have a clear understanding of our needs."
"We use them because of the quality of work, technology knowledge and price."
"They have excellent people who understand our needs."
"Quality, professional and available."
2021
A client said Marks & Clerk Law has “expertise in intellectual property and regulatory matters in the pharmaceutical field” and commended the firm for providing “appropriate advice in a timely manner”.
A patent protection client said: “We feel we can have open, strategic conversations with the team and they take time to understand our business and market sector. The service is world-class, and they make a complicated subject simple and easy to understand.”
One client explained why they use the firm: “I have been with the firm for over 10 years and their service has always been excellent. Critically, they integrate expert IP advice with very strong commercial and litigation advice. The firm has extremely high-calibre individuals in all the departments I deal with.”
Another client uses the firm because of its “swift action and dependable advice”.
A satisfied brand owner said: “We have successfully used Marks & Clerk for over 10 years and have built up an extensive trade marks portfolio. The firm has consistently delivered on providing good advice and a very high success rate for acquiring new marks and protection of our existing marks. The team responds quickly to requests or problems that arise. Importantly, as a customer we feel valued.”
“They were responsive, practical, and listened to our input on strategy. Our matter was resolved to our satisfaction,” says a client.
A client referee appreciated the way the firm dealt with office proceedings: “Marks & Clerk takes the time to learn our business and dives deeply into the facts of each case. In opposition proceedings, they come prepared and are ready to handle anything that comes up during the proceedings.”
