He was employed at the Compagnie des Canons du Midi and he was a founder member of the Société d'histoire naturelle de Toulouse in 1866.
[1][2] He was interested in the beetles, of which he had a collection, gathered during his professional activities.
He switched his principal interes to the Hymenoptera and the Orthoptera once he had retired.
He published the Catalogue des Coléoptères du Languedoc, espèces observées dans quelques régions de cette province, notamment à Toulouse, Béziers in six papers between 1869 and 1882, with a simultaneous complete publication of this work.
[3] After his death Marquet's nephew gave his collection of reptiles to the Toulouse Museum.