Iris Brisson

Senior Associate, Member of the Finnish Bar

I advise our clients in assignments relating to dispute resolution. My main areas of practice are domestic and international court and arbitration proceedings.

Prior to joining Castrén & Snellman, I worked as an associate with the dispute resolution team of another Finnish law firm and as an in-house lawyer for a global company manufacturing mobile phones. During my studies, I gained valuable work experience by working as a trainee at reputable Finnish law firms and by completing an internship with one of the case management teams of the ICC International Court of Arbitration in Paris.

I hold a Master of Laws degree from the University of Helsinki.

Latest references

We represent a major energy company in arbitration. The dispute has arisen out of a long-term energy supply agreement and the value of the claims is approximately EUR 33 million.
Case published 19.9.2023
We advised Excelerate Energy on the conclusion of a lease agreement with Gasgrid Finland Oy for the Floating Storage and Regasification Unit (FSRU) Exemplar. The Inkoo LNG terminal project will have a significant impact on securing the supply of gas to Finland and Estonia as imports of pipeline gas from Russia cease. The Exemplar is the first FSRU in Finland and the Inkoo LNG terminal project is legally unique. Moreover, the project, which is critical for Finland’s and the Baltics’ gas supply, was completed in an exceptionally short timeframe. Our experts assisted the company in a wide range of areas including contracts, energy legislation, licensing, labour law, taxation and structuring.
Case published 9.6.2023
We successfully advised the Finnish Broadcasting Company, Yleisradio Oy, and its Editor in Chief in a defamation case before all levels of the Monegasque judiciary. The case concerned four articles published by Yleisradio in 2022, two of which were in Finnish and two in English. The counterparty was of the opinion that the claims made in the articles violated his honour and brought defamation charges against Yleisradio and its Editor in Chief in Monegasque courts. In addition, he claimed damages totalling EUR 100,000 and demanded the removal of all allegedly defamatory content under penalty of a fine. We challenged the jurisdiction of the Monegasque courts in the matter, as the articles were not directed at a Monegasque audience and, contrary to what the counterparty claimed, jurisdiction could not be based solely on the fact that the articles were published in English on the internet where they were available for all and could be translated into French using a browser functionality. Furthermore, we presented comprehensive arguments stating that the facts presented in the articles were truthful, presented in good faith as required by Monegasque legislation, and based on thorough research. We also highlighted that the counterparty’s actions constituted so-called forum shopping, i.e. the desire to have the case heard in a court he believed would be most favourable to him. The claim was heard by all three levels of Monegasque courts, as the counterparty appealed the judgments of the lower courts. The courts of first and second instance had deemed that the Yleisradio articles in question were not directed at a Monegasque audience, and the Monegasque courts were therefore not competent to hear the case. The Supreme Court of Monaco (Cour de Révision) stated that there were no grounds to link the allegedly defamatory claims to the country. Even though it was possible to access the online articles from Monaco as well, this did not mean that the articles were published in Monaco. This being the case, the Supreme Court of Monaco deemed that the local courts did not have jurisdiction to rule on the case and dismissed the counterparty’s appeal against the Court of Appeal’s decision. The Supreme Court’s decision is fundamental in upholding the freedom of expression in Europe. The opposite outcome would have encouraged similar intimidation lawsuits in countries favourable to the plaintiff, with the purpose of restricting dialogue and silencing critical voices. The unpredictability of judicial power and the risk of extensive – and expensive – trials could create an atmosphere of fear and increase self-censorship of those exercising their freedom of expression, especially journalists, other media professionals and researchers. The decision also reinforces the principle that forum shopping is not allowed. The Supreme Court’s decision is final. 
Case published 17.6.2025
We advised the Ilkka Paananen Foundation on a legal review relating to the use of a chatbot system utilising generative artificial intelligence.  The AI system provides conversational support to young people experiencing mental health issues and various life crises.  Our advice covered the AI Act, which regulates advanced AI systems, as well as data protection and other relevant local legislation.
Case published 16.6.2025
We are assisting eQ Commercial Properties Fund in the sale of a fully let property to Logistea AB (publ), with an underlying property value of EUR 25 million. The property is transferred through the sale of the shares in the property-owning company Kiinteistö Oy Hämeenlinnan Länsiportintie 15. Logistea is a Swedish real estate company focusing on warehousing, logistic and light industrial properties, and its shares are listed on Nasdaq Stockholm. The property was built in 2012, and it is located in Hämeenlinna. The property has a total lettable area of approximately 21,700 square meters and the entire property is leased by Faerch Finland Oy, a fully owned subsidiary to Faerch A/S which is a leading provider of sustainable, circular food packaging solutions.
Case published 5.6.2025
We advised Gasum when it acquired 100% of the shares in NSR Biogas AB and the remaining 1/3 of the shares in Liquidgas Biofuels Genesis AB. Gasum has already been the majority owner of Liquidgas Biofuels Genesis AB since 2023 and is now acquiring full ownership. Gasum is a Nordic gas sector and energy market expert. Gasum offers cleaner energy and energy market expert services for industry and for combined heat and power production as well as cleaner fuel solutions for road and maritime transport. The company helps its customers to reduce their own carbon footprint as well as that of their customers.
Case published 5.6.2025
We acted as legal adviser to Efima Oyj in its acquisition of the entire share capital of Sparta Consulting Oy, a leading data management consulting firm. The acquisition strengthens Efima’s position as a strategic development partner for large and medium-sized enterprises and supports the company’s growth strategy and ability to meet the growing demand for intelligent, data-driven business solutions. Founded in 2012, Sparta Consulting specialises in comprehensive information management, and its clients are primarily large Finnish companies in the banking and insurance, energy, and telecommunications sectors. Efima Oyj is a Finnish digital company that promotes the growth of large and medium-sized enterprises by streamlining and automating business processes and creating competitive advantage through innovative use of artificial intelligence and data. The company has over 250 experts in Helsinki and Tampere.
Case published 3.6.2025
We advised Pihlajalinna Plc on an arrangement whereby Pihlajalinna Terveys Oy and Ikipihlaja Setälänpiha Oy sold their special housing services business to Esperi Care Oy.  The transaction involved three Pihlajalinna Uniikki units in Hämeenlinna, Lohja and Riihimäki as well as Ikipihlaja Oiva in Raisio. As a result of the arrangement, more than 100 employees transferred to Esperi. Pihlajalinna is one of Finland’s leading private providers of social and healthcare services, offering a wide range of services to both private and public sector clients. Pihlajalinna has more than 160 locations across Finland.
Case published 2.6.2025

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