SZLEPER | HENRY Avocats has its source in the history of the law firm established by Paul Mathély. The firm has leading expertise and many years of experience in all intellectual property fields.

It is headed by Dariusz Szleper and Guillaume Henry, two lawyers who specialise in intellectual property. The firm and its members are regularly listed in the rankings of the best law firms.

In 2018, the firm was awarded the “Rising Team” trophy in patent law (“Décideurs” magazine) and is ranked by IP STARSamong the best law firms devoted to industrial property.


SZLEPER | HENRY Avocats is recognised for its ability to handle highly technical matters in a personalised manner. When needed, the firm can tap into a broad network of foreign correspondents and regularly works with specialists in a wide range of fields.

It provides its clients with support in developing and implementing a global intellectual property and trade secrets strategy.

It offers precise and pragmatic advisory services that aim to enhance and sustain their competitive advantage in the market.

It assists and represents its clients in pre-contentious and contentious proceedings before all judicial and administrative courts and agencies specialising in intellectual property law.

In addition, the firm is known for its efficiency, its flexibility due to its human scale and its expertise, which it provides at a reasonable cost.


Maintaining our knowledge

The firm’s lawyers maintain their high level of knowledge and expertise through substantial contributions to dedicated associations, such as the AIPPI, the APRAM and the AAPI, by teaching at the university level, in particular at the CEIPI  and the Sorbonne, and by publishing articles and books.

Effective teamwork

SZLEPER | HENRY Avocats is a firm that works effectively as a team on all matters. Each matter is handled by two of the firm’s lawyers. They also regularly consult with the firm’s of counsel lawyer.

Cooperation with the best specialists

The firm regularly works with specialists in other fields (engineers, accountants, economists, foreign lawyers or lawyers who work in other fields, etc.). The expertise provided by these skilled professionals contributes genuine added value to the handling of legal matters.