A representative of Hérault in the Legislative Assembly and of the National Convention, he generally voted with the majority. Bonnier voted for the execution of Louis XVI. He was a friend of Jean-François Rewbell and therefore was entrusted with various diplomatic missions, including to Lille to negotiate with Lord Malmesbury in October 1797 and to Rastadt in 1799 to negotiate with the congress. Negotiations at the latter went slowly and on 28 April, Bonnier, Claude Roberjot and Jean Debry were attacked by Hungarian hussars as they left the town, probably in an attempt to steal their papers. Debry was wounded, but Bonnier and Roberjot were killed.
- Chisholm, Hugh, ed. (1911). "Bonnier, Ange Elisabeth Louis Antoine". Encyclopædia Britannica. 4 (11th ed.). Cambridge University Press. p. 212. This cites Huefer, Der Rastadtergesandtenmord (Bonn, 1896).
- Auguste Chalamel, Désiré Lacroix: Album du Centenaire, les Grands hommes et les grands faits de la Révolution Française (1789–1804)