McDermott Will & Emery Further Strengthens its Corporate Team with the Arrival of Guillaume Kellner as Partner in Paris


International law firm McDermott Will & Emery continues to expand its corporate M&A and private equity team with the arrival of Guillaume Kellner as partner.

“We are taking another step forward in our development with Guillaume’s appointment. His track record of excellence and his expertise in regulated sectors in particular, are a perfect fit with the objectives we have set for ourselves. The first of which is to position ourselves as sector experts, backed by leading practices, providing a high value-added response to the strategic needs of our clients”, said Grégoire Andrieux, Managing Partner of the Paris office.

“We are also very pleased to welcome a new partner with great human qualities, to continue to advance our aims in an exciting and respectful culture”.

Guillaume’s practice focuses on corporate, M&A – listed and unlisted – and private equity. He possesses significant experience in the regulated sectors, particularly in Healthcare, acts on behalf of numerous funds and industrial groups and is particularly active in the infrastructure sector. Guillaume recently advised EQT on the acquisition of Colisée and Antin Infrastructure on the sale of Inicea to Korian. Guillaume is also very active with the French and foreign industrial groups that he advises in their developmental operations.

Since 2011, Guillaume Kellner served as a partner and head of the Corporate Department of Paul Hastings.

“I am honored and pleased to join McDermott in Paris and to continue the remarkable growth the firm has experienced in less than 10 years. I look forward to working with this ambitious and entrepreneurial team. Our goal is to accelerate the development of the firm’s activities in the infrastructure and regulated sectors by relying on the strong regulatory and healthcare expertise of McDermott’s teams,” commented Guillaume Kellner.

Admitted to the Paris Bar since 1997, Guillaume Kellner holds a Master’s degree in Business Law and Taxation, a DESS degree in Business Law and Taxation and the Diplôme de Juriste Conseil des Entreprises (DJCE)/Certificate in Company Law Specialization from the University of Strasbourg.

Guillaume is recognized as one of the market leaders in corporate M&A and private equity by the guides Chambers Global and Chambers Europe (2020), Legal 500 Paris, IFLR1000 and Décideurs, as well as by his peers in the Best Lawyers guide.

McDermott Will & Emery’s Paris office currently has 23 partners, including 15 partners in the Corporate department, with a total of 80 lawyers.

About McDermott

McDermott Will & Emery partners with leaders around the world to fuel missions, knock down barriers and shape markets. Our team works seamlessly across practices and industries to deliver highly effective—and often unexpected—solutions that propel success. More than 1,200 lawyers strong, we bring our personal passion and legal prowess to bear in every matter for our clients and the people they serve.