Díaz Arrieta was born on May 11, 1891 in the town of Buin on the outskirts of Santiago, Chile. He spent a year in the Seminary of Santiago, a year at the Instituto Comercial de Santiago, and finally attended dental school for a brief time. He then began a 25-year career in the Ministry of Justice eventually becoming the head of the Civil Registry. Despite receiving little formal training, he began his literary career at an early age. In 1913, he published two stories in the journal "Pluma y Lapiz" under the pseudonym Alone. He published his only novel in 1915 before devoting his attention to literary criticism. In a career spanning more than sixty years, Alone wrote for a wide array of newspapers and periodicals, penning, most notably, the column "Crónica Literaria", which first appeared in "La Nación" and later in "El Mercurio." He became well known for his fluid and distinct style, and is considered to be the greatest Chilean prose writer of the mid-20th century. Several writers profited from his active promotion of their work, especially María Luisa Bombal and the poet Gabriela Mistral. Despite his vehement opposition to Communism, he nevertheless was an outspoken admirer of the poet and Pablo Neruda who was a prominent member of the Communist Party of Chile. He was a staunch catholic and supporter of the right-wing political movement that culminated in the 1973 overthrow of the leftist President of Chile, Salvador Allende.