His grandfather Clément Génissieu left that village towards the end of the 17th century and established himself as a merchant in Chabeuil.
[1] On 31 March 1793 Génissieu spoke in the Convention in favor of banning performances of Voltaire's play Mérope.
[1] After the Thermidorian Reaction of 9 Thermidor II (27 July 1794) Génissieu was charged with examining the conduct of the revolutionary tribunal of Brest.
His reports on the conduct of the deputies Dupin and Chaudron-Rousseau, justly accused of great misdeeds, were equally dispassionate.
[1] In a speech on 11 Floréal III (30 April 1795) Génissieu discussed the dilemma that to make the Committee of Public Safety more efficient by giving it more power would risk a dangerous transfer of authority from the elected convention to the anonymous bureaucracy.
[5] Génissieu was the author of the law of 28 Thermidor III (15 August 1795) that declared void all revolutionary judgments since 10 March 1793.
While maintaining his position on the émigrés, on 18 Fructidor III (4 September 1795) he asked that Charles Maurice de Talleyrand-Périgord be removed from the list.
However, after having voted for a law that allowed the accused to challenge their judges in some circumstances, he declared that the parents of émigrés could not sit on juries.
He refused this position and was named deputy commissioner of the Court of Cassation on 14 Germinal IV (23 April 1796).