Upon finishing his studies, he began collaborations with such important newspapers as Germinal, El País, Vida nueva, La España Moderno or El Socialista, among others. In those times he shows himself with reformist socialist tendencies, making friends with intellectuals of the stature of Azorín and Pio Baroja. His intellectual positions lead him to be an active part of the generation of ’98, a group of intellectuals who formed an important ruling cultural and artistic movement at that time.
He was a staunch enemy of his generation and, rectifying his anti-Christian attitude, he promulgated the idea that the Spanish race should be more traditional and less Europeanizing.
In 1928 General Primo de Rivera appointed him ambassador to Spain in Argentina. Deal with Zacarías de Vizcarra, the introducer of the idea of Hispanicness that attracted many thinkers of the time, including Maeztu himself.
The writer saw society as an accumulation of decadence without values that had to be changed in one way or another, using Catholic values and Hispanic traditions as an example to follow.
Later he participates in the magazine Spanish Action days prior to the proclamation of the Republic and awarded the prize Luca de Tena, awarded by the newspaper ABC for the content of its anti-progressive articles.
Write the treatise Defense of Hispanidad, becoming his most important and influential work for all people related to his ideals. Donoso Cortés, Menéndez Pelayo and other personalities of that time fervently supported the aforementioned work.
He was also a writer of poetry, short story and novel, but he emphasized his ideals more since what he wanted was to change the way of thinking of the people of his generation and “open” their minds with his traditionalist ideology. He also wrote some theater.
At the beginning of the Spanish Civil War, was arrested by the republican forces and imprisoned in the prison of Las Ventas in Madrid. October 29, 1936 is shot and buried in the Aravaca cemetery.