Gareth specialises in biotechnology-related patent work, with particular expertise in genomics and peptides. For his doctorate he conducted research into human molecular biology and genetics, which was funded as part of the Human Genome project. His patent practice includes inventions relating to therapeutic antibodies and proteins, stem cells, pharmaceutical formulations, genetically modified organisms, diagnostic and screening methods, and research tools.

As well as filing and prosecution of patent applications worldwide, Gareth has extensive experience of attending hearings at the European Patent Office. His practice also involves advising on patent term extension, infringement matters and general intellectual property strategy.

He provides freedom to operate and other due diligence reports on complex IP portfolios for clients considering investing in or acquiring IP assets.

Gareth is a frequent speaker at conferences, and has published many articles on aspects of biotechnology patenting practice, as well as authoring Marks & Clerk's annual strategic Biotechnology Reports. He contributes to a number of IP manuals, most notably "The Annotated European Patent Convention" by Derk Visser.