Philippe-Fitzpatrick Onimus

Vice President of ADA, Partner at Deynecourt

Philippe-Fitzpatrick Onimus

Philippe-Fitzpatrick Onimus is the partner in charge of the Litigation and Dispute Prevention practices at Deynecourt. Philippe advises domestic and international clients on corporate and finance disputes, where he focuses on cross-border white collar crime and has a recognised expertise in banker’s liability. In addition, Philippe has substantial experience in civil and commercial law, touching aspects of corporate law, advising on topics such as director’s liability, shareholders’ disputes and other international litigation issues. He is therefore in a position to provide a large scope of services required in the life of a corporation, from its incorporation to its winding up, including but not limited to, the drafting of commercial contracts and settlements whether national or cross-border, the negotiation with tax authorities in Luxembourg or abroad, business litigation, tackling minority shareholders issues and assisting in cross-border matters through the choice of broad network of international correspondents and the follow up of their work.

After a first set of professional experiences as officer in the French Army and as tax specialist on listed instruments in a major financial institution in Luxembourg, Philippe-Fitzpatrick joined the Luxembourg Bar in 1996. Prior to joining Deynecourt, Philippe was partner in another Luxembourg law firm.

Philippe lectures on banker’s ethics and compliance issues at the Institut de Formation Bancaire, Luxembourg (IFBL) as member of the Cercle de qualité ( He also advised a foreign stock exchange authority on market abuses on behalf of the Agence de Transfert des Technologies Financières (ATTF). From 2002 to 2009, Philippe was Chairman of Appui au Développement Autonome asbl, a non-governmental organization (NGO) globally recognised ( He now continues his commitment as Vice-Chairman of the Board of Directors. Philippe is also member of the Board of Directors of LuxFLAG, the investment fund labelling agency (

Philippe holds a Maîtrise en Droit des Affaires from the University of Strasbourg in Strasbourg/France and he is an alumni of the London School of Economics and Political Sciences in London/United Kingdom. Marathon runner, Philippe was a reserve officer of the French Army where he qualified as interpreter and staff officer.

Philippe is bilingual in French-English. He can moderately communicate in German.