 As women started to pursue advanced degrees in philosophy, they began to philosophize about the role of women in Mexican culture and the challenges facing aspiring female intellectuals and artists. The long list of Mexican feminists, which stretches back as far as Sor Juana, includes Paula Gómez Alonso (1896–1972), the first graduate of philosophy of the University of México, whose master’s thesis was titled La cultura femenina (1933); Rosario Castellanos (1925–1974), a famous author, who wrote a philosophical essay called Sobre cultura femenina (1950); and Graciela Hierro (1928–2003), the main proponent of feminist philosophy and founder of the Centro de Estudios de Género of the National Autonomous University of Mexico. Two of her books are Ética y feminismo (1985), and De la domesticación a la educación de las mexicanas (1989).