Ernesto Laclau´s thought has gone beyond Argentina´s boundaries and become a leading character of the international academic debate. Hegemony and Socialist Strategy, his first great work, co-written with Chantal Mouffe, managed to awaken the Left, by warning about the inability of Marxism to generate a political alternative. The idea of a radical democracy, both antagonistic and hegemonic, led to his main thesis on populism. This way, that cursed word that always generates so much rejection, was recovered by Laclau, thus giving birth to On Populist Reason in 2005, which like Hegemony… struck the intellectual world a second time. Under the influence of Marx, Gramsci, Lacan and Derrida, Laclau has proven to be a referent of post-Marxism, due to the contribution of his invaluable theoretical capital to the reflection about the discursive nature of the social framework. His political commitment has driven him to follow the path of militancy in the Argentinian Socialist Party from a very early age and later in the PSIN with Jorge Abelardo Ramos, with whom he published Lucha obrera until Eric Hobsbawn invited him to study in Oxford. Currently he is a Distinguished Visiting Professor in Rhetoric and Humanities at Northwestern University, and director of the CEDIS, in San Martin University. His most important works, among others, are Politics and Ideology in Marxist Theory, Emancipation(s), Mysticism, Rhetoric and Politics, and Contingency, Hegemony, Universality, written alongside Judith Butler and Slavoj Žižek.