Since 1967 he worked as an editor and director in different periodicals including El diario montañés, Arriba,[1] Revista de Geografía Universal and Free Lance'e International.
On December 29, 1980, Gurriarán left the building of the newspaper Pueblo ("The People") and entered a telephone booth to talk to his wife.
The Spanish journalist, who relied on his cane, gave a book by Martin Luther King, as a gift, to the leader of the Armenian group, to think about the path they have chosen.
Soon after the incident, La Bomba was released; it relayed the personal experience of a Spanish journalist and the tragic story of survival of a whole nation.
French filmmaker Robert Guediguian, who directed the movie Una historia de locos based on Gurriarán's books, wrote that "Guriarran has gone to heaven of the righteous".