The team
Boutique law firm, WJ Avocats is made up of lawyers and legal experts practicing in several languages, as consultants and litigators.
The team’s skills are cross-disciplinary and complementary, enabling a global grasp of the most complex situations and the ability to intervene before all national, foreign and international jurisdictions.
Thanks to its 20 years’ experience in international litigation, the firm can guarantee its clients, be they natural persons, legal persons or institutions, its absolute availability as well as the highest quality of tailored support.
William Julié
Founding Partner
Paris Bar
Works in French and English
- INTERNATIONAL CRIMINAL LAW
- Criminal Law
- WHITE COLLAR CRIME
- Sanctions
- INTERPOL
- Human Rights
- COMPLEX CROSS-BORDER LITIGATION
Memberships
- International Criminal Law Officer of the International Bar Association (IBA)
- European Bar Association (ECBA)
- President of the Commission Pénale de l’Association des Avocats Conseils d’Entreprises (ACE)
- Forum des Avocats Spécialistes de l’Extradition (DELF)
- Association des Juristes Franco-Britanniques (LBLS)
Member of the Paris Bar since 2000, William JULIÉ is a Franco-British lawyer, who worked mainly in criminal law, before focusing his practice on International and European Criminal Law.
After studying International Law at the University of Paris-Sorbonne (Paris I), William JULIÉ turned to Criminal Law, obtaining a doctoral certification (Doctorat d’études approfondies) in European Criminal Justice Policy directed by Professor Mireille Delmas-Marty while also attending the Institute of Criminology at the University of Paris-Assas (Paris II).
His first years fine-tuning his skills as a criminal and fundamental rights lawyer were spent working alongside renowned professionals, amongst whom Maître Henri Leclerc (President of the Human Rights League).
He has developed a strong practice in International and European criminal litigation, especially in extradition proceedings, international and European arrest warrants, and withdrawal of INTERPOL Red Notices.
He has since extended his practice to complex and technical international and transnational litigation cases, in particular international and European sanctions, including before the Court of Justice of the European Union, and the recovery of frozen assets.
He regularly intervenes as a legal expert in criminal law and human rights law before foreign courts.
William JULIÉ is on the List of Counsel to the International Criminal Court.
Amélie BEAUCHEMIN is an attorney at the New York Bar and Paris Bar.
Before joining WJ Avocats, she taught an introduction to International Criminal Law within the International Law program for Arabic speakers at the Washington College of Law and worked for the international co-prosecutor’s office in the Extraordinary Chambers in the Courts of Cambodia (ECCC). She also collaborated with several Syrian NGOs, coordinating the work of the teams on the ground and co-teaching the principles of International Criminal Law and Crime Documentation to Syrian lawyers and activists.
She holds a bilingual Master’s degree in International and European Law from the University Paris-Ouest Nanterre La Défense and an LL.M in Human Rights and Humanitarian Law from the American University Washington College of Law.
At WJ Avocats, she developed a strong expertise on international sanctions matters and assisted multiple clients in the context of annulment proceedings.
She also regularly works on cross-border criminal cases.
Elena MORENO is an attorney at the Paris Bar.
She completed a double degree in Franco-English law, obtaining an LLB in English law and a Maîtrise in international and European law. She also holds a Master II in International Law and Organizations from the Université Paris I Panthéon-Sorbonne.
After various experiences in international criminal law and human rights (Council of Europe, United Nations High Commissioner for Refugees and the European Parliament), she worked on European sanctions litigation as an associate at Acquis EU Law & Policy.
Elena MORENO joined WJ Avocats in 2024, and mostly covers INTERPOL, extradition and European sanctions cases.
Camille GOSSON is an attorney at the Paris Bar.
She graduated with a Master 2 in International Criminal Justice and a Master 1 in Criminal Law and Criminal Sciences from the University of Paris-Panthéon-Assas. She also has a background in Common Law from the same university and an exchange year at McGill University.
After working with a defense lawyer in Montreal, she joined the International Law Clinic of Assas to work on the qualification of international crimes committed during the conflict in Tigray, Ethiopia. In 2023, she was part of the Defense Team for Mr Pjetër Shala at the Kosovo Specialist Chambers in The Hague.
At WJ Avocats, she mainly works on cases related to INTERPOL (red notices) and International and European Criminal Law (sanctions).
Aurora PINELLI holds a double degree in European Social and Political Studies from Sciences Po Paris and University College London. As part of her Master 2 Global Business Law & Governance, taught jointly by Columbia Law School, Sciences Po Paris and Université Paris-Sorbonne, she is currently studying European human rights law, public and private international law, international criminal law, CSR and corporate responsibility, in particular the crimes committed by the Burmese regime against the Rohingya.
She worked for an NGO assisting victims of the Srebrenica genocide in Bosnia-Herzegovina, before integrating the criminal business law team of the law firm A&O Shearman. She then joined Columbia Law School’s Human Rights Institute, where she worked for the Trial Watch Project of the Clooney Foundation for Justice.
She joined the firm as a legal intern in January 2025.
Trainee Lawyer since January 2025, Mathieu MORVAN holds degrees from the Magistère in Applied Public Law at the University of Montpellier and from Paris 1 Panthéon-Sorbonne University, where he completed a Master’s in Human Rights and EU law.
His academic and professional background is oriented towards the protection of human rights and international litigation. He has completed internships with the French Ombudsman, the French Advocate General at the Court of Justice of the European Union, and in law firms specializing in immigration and international protection law.
These experiences have enabled him to develop a rigorous and committed approach to fundamental rights litigation, both at the national and European levels.
Mathieu joined the firm as a trainee lawyer in July 2025.
Trainee Lawyer
Works in French, English and Spanish
Trainee Lawyer
Works in French, English, and German
Martin DEMOMENT holds an LL.M. in International Criminal Law, run jointly by the Amsterdam Law School and Columbia Law School (New York City, United States). He previously earned a Master 1 degree in Public Law from Université Paris I (Panthéon-Sorbonne), a Bachelor of Laws from Université Paris II (Panthéon-Assas), a Master’s degree from the School of Public Affairs at Sciences Po Paris, as well as a Bachelor’s degree in Political Science from Sciences Po Paris.
He gained diverse experience in the field of international criminal justice, including positions at the International Criminal Court, the Clooney Foundation for Justice, and with lawyers specialized in international criminal law. He also worked alongside the liaison judge at the French Embassy in Dakar.
Admitted to the Paris Bar entrance exam in 2023, he joined the firm as a trainee lawyer in June 2025.
Juliette GUÉNAL graduated from the University of Paris I Panthéon-Sorbonne with a Master’s degree in Justice Systems and Trial Law and holds a University Diploma in Criminal Law and Criminology from the University of Lille.
She gained experience within the judiciary, as an intern in the Office of the Prosecutor-General at the Cour de cassation and as a legal assistant in the civil division of the Paris Court of Appeal. These positions enabled her to develop expertise in international private law and human rights litigation, through the handling of complaints brought against France before the ECHR and the United Nations Human Rights Committee. She then gained significant experience in a law firm specialized in criminal law.
Juliette joined the firm as a trainee lawyer in July 2025.
Trainee Lawyer
Works in French and English
