After having worked in the food industry, he began his political career as a village councilman in 1974.

Between 1992 and 2002, he was president of the French mayors association and a Senator of the Pas-de-Calais départment,[1] before being promoted to Minister of the Civil Service.

[2] Since 14 September 2017, he was High commissioner in charge of the French pension system reform.

It was revealed by the Le Parisien in December 2019, then by Le Monde and Capital, that he forgot to indicate to the HATVP several functions he had in various organisms, some of them paid and illegal under the French constitution, and including some which could be a Conflict of interest with his role in the government.

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