A graduate of the Institut d'études politiques de Paris, and a former student of the Ecole normale supérieure and the ENA (French National School of Administration), Frédéric Mion began his career by joining the Conseil d'Etat in 1996 as an auditor and then as maître des requêtes.
In 2000, he joined the Ministry of Education as an advisor to the Minister's office, and in 2001 he joined the Ministry of the Civil Service as deputy to the Director General of Administration and the Civil Service.
He became a lawyer in 2003 with Allen & Overy LLP.
In 2007, he joined the Canal+ group as Secretary General, a position he held until 2013. Later that year, he was elected Director of Sciences Po and held this position for eight years, before returning to the Conseil d'Etat in 2021.