Marc Del Grande graduated at the Special Military School of Saint-Cyr.

[3] Between 1991 and 1992, Del Grande was a military observer of the United Nations in Cambodia in the Khmer-held Angkor region.

[4][5] Between 1999 and 2001, Del Grande was the commander of the Gendarmerie of Saint-Laurent-du-Maroni in French Guiana.

[4] Between 21 July 2015 and June 2019,[4] Del Grande was appointed as the Secretary General and Sub Prefect of Pas-de-Calais.

[3] On 5 August 2019,[1] Del Grande became the Prefect of French Guiana.