Arthur Dethomas is licensed in Paris and in New York. He began his career at Salans, before joining Cotty Vivant Marchisio & Lauzeral where he was elected to the partnership in 2007. He was appointed Premier Secrétaire de la Conférence of the Paris Bar in 2003.
Renowned for his expertise in corporate law, stock exchange and financial litigation and in white-collar criminal law, he is an expert at the Club des Juristes (a French legal think-tank). Arthur Dethomas is recommended by Legal 500 as being "equally at ease in the courtroom as in the boardroom" and recognized as a "leading individual" in litigation by the Chambers & Partners guide, according to which "skilled litigator Arthur Dethomas wins praise for his ability to design and execute strategies".
He teaches a class in Financial regulation at Sciences-Po Paris.
Arthur Dethomas has a master degree in Business Law (University of Paris X) and an LL.M. from Washington College of Law (A.U.). He is fluent in French and English. A former lecturer in law at the University of Phnom Penh, Cambodia (1998-1999), he also speaks Khmer.