Proust holds a postgraduate degree in market and management sciences from the centre of studies and research of Clermont-Ferrand and works as an insurance agent.

During this mandate, he asserted the fact that there could be no competitiveness for European businesses as long as external trade relations are not balanced.

He was rapporteur on Monitoring EU/third country trade in drug precursors,[3] such as regulations concerning rules for the monitoring of trade between the Community and third countries in drug precursors as well as with the Federation of Russia He was also rapporteur on CARS 2020: towards a strong, competitive and sustainable European car industry (European Commission's action plan),[4] he strongly argued in favour of greater competitiveness in the automotive industry.

[2] He was the rapporteur for the Commission proposal on the establishment of a framework for the screening of foreign direct investments in EU Member States.

[9] This accusation follows suspicious calls for public tenders made in 2006 by the Nîmes Métropole mixed economy company when Proust was its president.

While he was president of the SENIM (mixed entreprise of Nîmes Métropole from 2001 to 2008, Franck Proust was accused of having favored the sale of land to a developer (Jean-Luc Colonna d'Istria).

On Thursday, April 14, 2021, Franck Proust is sentenced by the Court of Appeal of Nîmes to 12 months suspended prison, 15,000 euros fine and five years of ineligibility.