Jennifer Harris MRSC


Jennifer gained a Double Honours degree in Chemistry and Biochemistry from the University of Southampton, and during the course of her degree spent time gaining practical experience in the areas of medicinal and combinatorial chemistry at BioFocus. Since 2001 she has been working in the patent profession, qualifying as both a UK and European Patent Attorney in 2005 and working with Kilburn & Strode LLP since 2006. Jennifer's practice focusses on the drafting and prosecution of patent applications before the EPO, UKIPO and worldwide, representing clients in hearings at the EPO and providing infringement and validity opinions. She works with companies ranging from start-ups and university technology transfer offices to multinational companies. Her work has a particular emphasis on pharmaceuticals, but she also works in many diverse areas of chemistry, including glass, ceramic and composite material technology and process chemistry.

Mr Stuart Jackson CChem MRSC

Immediate Past Chair

Stuart Jackson gained a degree in Chemistry from Imperial College, after which he pursued research at Oxford involving enzyme mechanisms.  After a few years in the brewing industry, he subsequently spent 15 years as a chemist and project manager in the health care industry, principally in the field of wound healing.  He qualified as a solicitor in 1996, and now specialises in intellectual property law, particularly patent law, undertaking both litigation and non-contentious work such as licensing.

Dr Joseph Lenthall MRSC


Joe gained a Chemistry degree from Durham University.  Joe gained experience of IP law by working for technology transfer offices in Oxford and London, before returningto Durham University to complete a Ph.D. working on selective recovery of platinum group metal catalysts from mixed metal solutions (sponsored by BP Chemicals).  Joe is now a Partner and patent attorney within the chemistry and materials team at Mewburn Ellis LLP.   His work focusses on pharmaceutical, medtech, industrial chemistry and consumer product industries, representing major multinational companies within those industries.  In addition to managing patent portfolios and drafting and prosecuting patent applications. Joe is particularly involved in EPO opposition and appeal work, and has gained experience of patent litigation in the UK courts.

Dr Howard Rosenberg CChem MRSC


Howard qualified as a medicinal chemist, having read Chemistry at The Queen's College, Oxford, and then completed a Ph.D. in the Pharmacy Department of the University of Manchester. He then entered the pharmaceutical industry and spent several years in medicinal chemistry research, firstly synthesizing radio-labelled compounds at May and Baker and then 9 years at Beecham Pharmaceuticals researching into several different disease areas before changing direction and moving to Generics [UK] Ltd. in 1986. The company then became Merck Generics where he was appointed the Group IP and API Strategy Director and was responsible for the start up of several distinct and diverse teams covering areas ranging from IP to API synthesis. He was involved not only with Intellectual Property matters on an international scale but also in Regulatory Affairs. He helped to instigate and develop the lobby organization, now known as the European Generic medicines Association, EGA, for the European generics industry. Howard also worked as Scientific Advisor in the London office of Frommer, Lawrence and Haug, LLP before setting up his own consultancy, Pharma Tactics Limited.

Mr Leythem Wall CSci CChem MRSC

Committee Member

Leythem has a Masters degree in Chemistry from Oxford University, which involved a final year working for Professor Peter Edwards FRS investigating the dielectric catastrophe in high temperature superconducting systems. He is a Chartered UK Patent Attorney, a European Patent attorney, a European Trademark and Design Attorney and works in the London office of the international law firm Finnegan, Henderson, Farabow, Garrett & Dunner LLP. 

Leythem has also previously held positions as in-house IP counsel for major multinational corporations in the UK and abroad. His work focusses on a variety of technologies in the chemical and medical fields including agrochemicals, pharmaceuticals, petrochemicals, coatings, foods and medical devices. Leythem specialises in patent drafting, prosecution, advice on infringement and validity and he has particular expertise in Oppositions and Appeals, including representation in Oral Proceedings before the European Patent Office in Munich and The Hague.

Dr Oliver Rutt MRSC

Commitee member

Oliver has an MChem and a DPhil (Inorganic Chemistry) from the University of Oxford. He is a Chartered Patent Attorney and European Patent Attorney, and is a partner of the firm Boult Wade Tennant. Oliver has experience in drafting and prosecuting patent applications, patent portfolio management, providing advice regarding infringement and freedom-to-operate, as well as in contentious proceedings including oppositions and appeals. Before entering the profession Oliver conducted academic research in the areas of solid state chemistry and lithium-ion battery technology. During his research, he gained practical experience of the synthesis and characterisation of non-oxide anion and mixed-anion solid compounds, including the use of techniques such as diffraction and NMR. He has co-authored a number of scientific journal publications.

Jo Addison MRSC

Committee member

Jo has an MSci in Chemistry from Cambridge University. During her degree, Jo carried out academic research in the area of colloid and interface chemistry. Jo is now a European and UK patent attorney in the Chemistry and Life Sciences group at Haseltine Lake LLP. Jo drafts and prosecutes UK and European patent applications covering a wide range of chemical subject matter including petrochemicals, materials, chemical engineering, chemical physics, polymer chemistry as well as foods and pharmaceuticals. Prior to becoming a patent attorney, Jo worked as a science teacher as part of the Teach First scheme.

Sophie Arrowsmith

Committee member

Sophie is a solicitor at Hamlins LLP and advises clients on protection and enforcement of IP rights, IP exploitation, collaboration agreements, websites and e-commerce, marketing, consumer law and data protection and general commercial issues, as well as providing support to the corporate team in commercial and IP matters.  Before commencing her legal career, Sophie obtained experience in the science and technology sector businesses when conducting two internships with the pharmaceutical company, Pfizer Inc. Sophie has continued her interest in this area after converting to law including by being a committee member of the RSC Law Group.   Sophie has supplemented her practice by gaining the University of Oxford’s Postgraduate Diploma in Intellectual Property Law and Practice.