He was born in Tours, Indre-et-Loire and studied in Paris where he befriended fellow student Jean-Paul Sartre at the Lycée Henri IV.
He interrupted his studies at the École Normale Supérieure of the University of Paris in 1926 to leave for Aden where he worked as tutor to the son of French-born businessman-millionaire Antonin Besse.
Through this period, up to the onset of World War II, Nizan penned all of his major works, including "The Watchdogs", an exposé on materialist philosophy, and the novels Antoine Bloye and The Conspiracy.
His motive was not a moral judgment against the USSR; on the contrary, he criticized the French Communist Party for having lacked cynicism: Only events will confirm or invalidate me.
[7]Given his active participation in the anti-fascist movement, as well as his commitment to the republican cause of the Spanish Civil War, Nizan could not accept the party's rapid shift against the Popular Front.
Soon thereafter, Nizan enlisted to fight in the French army with the onset of World War II, and was killed in action on 23 May 1940 at the Château de Cocove in Recques-sur-Hem, during the German offensive against Dunkirk.