Benjamin graduated from the Ecole Normale Supérieure de Paris in 1994 in Mathematics, he joined the Directorate General of Armaments until 2002, when he became rapporteur at the Cour des Comptes. In 2007, he was appointed Deputy Director of Energy Markets at the Ministry of Ecology, Sustainable Development and Energy. In 2009, he joined the Office of the Minister of Defense (Hervé Morin) as Advisor for Industrial Affairs. In 2010, he became Industry Energy Advisor to the President of the Republic (Nicolas Sarkozy). Between 2012 and 2017, he held the position of Deputy Director General of the General Directorate of Enterprises within the Ministry of the Economy, Industry and Digital Affairs, then between 2017 and 2021, he was Deputy Director of the Civil Cabinet and Military of the Minister of the Armed Forces (Florence Parly), then between January 2021 and May 2022, he serves as Deputy Director of the Prime Minister's Service (Jean Castex). Finally, in January 2023, he was appointed Interministerial Delegate for the supply of strategic minerals and metals, a position reporting directly to the Prime Minister.