Billant served as the sub-prefect of
Neufchâteau, Vosges from 2000 to 2002. He was the head of Minister of the Interior
Marie-Josée Roig's office in 2005. He was chief of staff for the prefect of
Alpes-Maritimes from 2007 to 2008. He was chief of staff to Minister of Justice
Rachida Dati from 2008 to 2009. Billant held the position of prefect of
Ariège from 2009 to 2011, and of
Dordogne from 2011 to 2014. President
François Hollande appointed him
prefect of
Guadeloupe on 12 November 2014. President
Emmanuel Macron appointed Billant as prefect of
Puy-de-Dôme on 9 August 2017, and he took office on 4 September. Macron appointed him as
prefect of
Réunion on 29 May 2019, and he assumed office on 17 June. He was appointed prefect of
Pas-de-Calais in 2022. He succeeded Louis Le Franc as
High Commissioner of the Republic in New Caledonia on 9 April 2025. ==References==