The firm

FIRSH was founded by Claire POIRSON, member of the Paris Bar since 2006, who spent nearly 20 years years working in large, reputable Anglo-Saxon and French law firms.

With this rich professional experience, where she has acquired the know-how in consulting and litigation, the commercial know-how, she takes off in 2023 to found FIRSH. Her creation was born of a desire to be even more aligned with her values of freedom, equality and justice and convinced that another form of governance for a business firm had to be found, closer to those of the common good and putting forward the collective intelligence of all the actors in the firm. This is why FIRSH is an entreprise à mission to serve the law and innovation. The firm also has a laboratory, FIRSH LAB, which works on governance, collective intelligence and the common good, necessary for the preparation of tomorrow’s law in its areas of expertise: Intellectual Property, Tech, Data, Artificial Intelligence, NFT and metaverse.
Convinced that the law frames progress and that lawyers have more than a duty of vigilance, and that they actually have a role in driving change, she has developed a strong expertise in all legal issues related to societal, digital, and ethical challenges.
She is accompanied by a team of lawyers and partners that she has carefully selected for their expertise and for their values.


Léa Monel

A member of the Paris Bar since January 2019, Léa Monel works in all areas of intellectual property, new technologies and data protection, as well as in commercial contracts.

She advises and represents tech startups as well as French and foreign corporates in various sectors such as technology, publishing, audiovisual, luxury. 

Léa graduated from Poitiers University (Master II in intellectual property – business law) and Magistère in technology, information and communication law.

Before joining Firsh, Léa Monel carried out several internships, working with the law firm De Pardieu Brocas Maffei and with the Brand Department of the L’Oréal Group. She also worked as an IP / IT / Data protection and commercial contracts associate within Bersay for 5 years.

Clarity – Reactivity – Humanity – Pragmatism & Efficiency –


Accompanying, adapting and anticipating legal needs in light of today’s and tomorrow’s challenges.

FIRSH is the law firm for all those who undertake innovation and progress.
In both consulting and litigation, we offer our clients the possibility of being accompanied in their entrepreneurial approach, with the objective of using the rule of law as a performance tool in the service of Innovation and progress.

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Our ecosystem

Our ecosystem

Law is often only one component of a strategic project.

FIRSH has built a solid network of legal, financial, and strategic experts, specialists in CSR, the Circular Economy, and climate and energy issues, both in France and internationally.
This ecosystem is the common property of our clients and becomes the FIRSH community.
FIRSH, at the center, interacts, protects and multiplies this ecosystem tenfold at the service of the community, which enriches and helps each other



Law is at the heart of human activities and interactions. Innovation goes faster than law.
Law is at the service of innovation.

This is why FIRSH is “entreprise à mission” (a French legal framework in which businesses pursue a set social and environmental purpose with specific sustainability goals).

Dignity, conscience, independence, probity and humanity. These principles of the lawyer’s oath are a valuable aid in developing a policy of corporate social responsibility that is at the heart of our daily work.

FIRSH is committed to several causes necessary for a more just and peaceful society.

For a fairer society

Through its actions within three associations – the French Association of Women Lawyers (AFFJ), the European Women Lawyers Association (EWLA), the Gender and Governance Action Platform (2GAP) – equality between women and men is at the heart of the firm’s commitments.

For a humanist society, centered on the human being above all

The firm has participated and still participates in the evacuation of Afghan women and families threatened by the Taliban since the capture of Kabul. This action continues in France through mentoring assistance via 2GAP’s female and mixed professional networks.

For a society using technology for progress

The firm is part of the Tech For Good movement and is committed to taking a stand on responsible, inclusive and ethical artificial intelligence

Eco-responsible website

To reduce its environmental impact on the web, the website is eco-designed, its design is uncluttered, the site contains few photographs and does not host any video to reduce energy consumption.