In addition to his role as a university lecturer at the University Hospital of Versailles, Loïc Josseran is also a public health researcher. From 2003 to 2010, he worked as an epidemiologist at the French Institute for Public Health Surveillance, before being appointed as a technical advisor on public health, health safety and prevention from 2010 to 2012 in the cabinet of the then Secretary of State for Health, Nora Berra. He now brings his expertise to the Korian Foundation for Ageing Well, where he is building a predictive database for epidemiology monitoring in care facilities.
Loïc Josseran has developed a real-time health surveillance system based on hospital emergency departments (260 departments), SOS Médecins services (55 organisations) and local authority registration records (3,000 towns). Every day, this system gathers data generated by these sources, which is used to monitor changes in the health of the French population. He is the project leader for the development of an app to integrate, convert and automatically produce bulletins and analyse this data. He has published around twenty scientific articles.