Etienne began his career in European public affairs in Brussels and became in 2009 parliamentary advisor to a Member of the European Parliament. From 2013 to 2017, Etienne was a group policy advisor for the committee on civil liberties, justice and home affairs in the European Parliament, following legislative and policy developments in the fields of fundamental rights, police and judicial cooperation, criminal law and internal security. He notably participated to the legislative process and negotiations leading up to the adoption of the General Data Protection Regulation (GDPR) and the Data Protection Directive. In 2017, Etienne joined the French data protection authority (CNIL) within its department of European and International Affairs, where he took part to the work of the Presidency team of the EU Article 29 Working Party. Etienne now continues contributing to the work of European Data Protection Board (EDPB), in particular by participating to the development of guidelines on the GDPR key provisions, as well as on issues related to personal data processing for law enforcement purposes.

Etienne graduated from the Sorbonne’s School of information and communication sciences (CELSA) and the Strasbourg Institute of Political Studies (Sciences Po Strasbourg).