Born in Toulouse, Gros married Félicité Labille in 1764, becoming the brother-in-law of Adélaïde Labille-Guiard.
She died four years later, and in 1770 he remarried, to the painter Pierrette-Madeleine-Cécile Durand.
He was active as a miniaturist and pastellist during his career.
Some sources give his date of birth as 1725.
This article about a French painter born in the 18th century is a stub.