 He was given responsibility for personnel at the Navy Ministry, in which post he oversaw the creation of the École Navale at Brest.He served as Minister of Marine from 1 March 1840 to 29 October 1840 and again from 7 February 1843 to 24 July 1843 when he retired due to ill-health

Roussin married in 1814 with Illumante Bihet Pontigny.They had two daughters and a son, Albert, who was later an admiral and also served as Minister of Marine.