  In 1950, at the age of 25, Castellanos defended her master’s thesis in philosophy at Universidad Nacional Autónoma de México (UNAM). The project, titled Sobre cultura feminina, explored women’s role in the production of culture (Gargallo 2004: 89). She was a prolific writer. However, Castellanos is largely remembered as a literary figure and a poet. It was not until 1974 (after her death), that the publication of her most famous work El Eterno Feminino was recognized as theoretically rich, speaking on themes of gender, ethnicity, and nationhood. Today, she is recognized as a leading voice in the feminist movement of Mexico, her work arguing for the construction of a feminine subjectivity that defies the identity imposed by patriarchal cultural norms. As a result, her work has aided in establishing a different vision of political life for women in Mexico (Gargallo 2004: 90).