This paper analyzes how María de los Ángeles Yannuzzi explained and interpreted Argentine political history through rigorous application of modern political theory concepts and political science theories. In particular, we study her contributions to the research agendas regarding the "Proceso de Reorganización Nacional" (1976-1983) and the Menem administration (1989-1999). At first, we study her theoretical and methodological contributions by the application of political theory concepts to the interpretation of political history and, specifically, to conceptualizing the last military dictatorship and the dynamics of the political system during the Menem presidency. In the second section, we show the superb way in which Yannuzzi described and explained Argentine political history from a political science point of view. In conclusion, she analyzed normatively relevant problems in a very original way, combining political science explanations with a political theory interpretation about the meaning and dynamics of authoritarianism and democracy in contemporary Argentina.