Hanna Dzieglewska

Head of Biotechnology Group


Hanna Dzieglewska joined the firm in 1987 and became a partner in 1995. After obtaining her First Class Honours Degree in Biochemistry specialising in Neurochemistry, Hanna went on to obtain a PhD in Biochemistry, focusing primarily on enzymology, protein purification, and microbial physiology.

Hanna is Head of the Dehns Biotechnology team.


Type of clients and client work

Hanna’s clients include small-to-medium-sized companies or sole inventors, as well as larger companies. Her work includes all aspects of patent portfolio management worldwide and she has extensive experience of working directly and closely with inventors to identify patentable inventions and draft patent specifications, including helping to guide patent-focused research. She has particular experience in developing patent portfolios and IP strategies for her clients, and providing them with robust advice throughout their commercial development process. This includes all aspects of the patent prosecution process, including EPO and foreign patent prosecution, and opposition work at the EPO.

Hanna’s work also includes advising clients in a number of areas including freedom to operate, evaluating patent portfolios and due diligence.



Since joining the firm, Hanna has worked in many technical areas of biochemistry/biotechnology including a variety of therapeutics and diagnostics, genetic engineering, and industrial biotech processes. Particular areas include antibody and cell-based therapies, aspects of immunology generally, peptide therapeutics, recombinant protein expression, transgenic organisms, vaccines, vectors, biological purifications and separations, nucleic acid manipulations and assays (including isolation, sequencing, amplification, detection, genomic and expression analysis etc), cells (e.g. cell culture, isolation, manipulation, assays etc) and also in related areas such as medical uses of known compounds.


Qualifications and Memberships

  • Authorised Representative before the Unified Patent Court (UPC) 2023
  • European Patent Attorney, 1992
  • UK Chartered Patent Attorney, 1991
  • Registered Trade Mark Agent, 1991
  • Fellow of the Chartered Institute of Patent Attorneys (CIPA)

Higher Education

PhD, University of Kent, Biochemistry, 1987

BSc Hons (First Class), Imperial College, Biochemistry, 1984



Many of Hanna’s clients are based in Scandinavia, which she visits regularly.

Hanna was named as a “recommended” patent attorney in the 2018 edition of The Legal 500.

In the 2023 edition of the Legal 500, a client testimonial stated that: “Hanna Dzieglewska is a standout partner and probably one of the best patent attorneys that I have ever used. She understands new innovations quickly, in order to grasp the crux of a matter.

Contact details

St Bride’s House
10 Salisbury Square
United Kingdom

+44 (0)20 7632 7200 +44 (0)20 7353 8895