Flann O Brien, born Brian O Nolan (1911-1966), was an Irish novelist, playwright, and satirist, renowned for his dark humor, imaginative prose, and contributions to the absurdist genre. Born in Strabane, County Tyrone, he grew up in a large, bilingual family, which influenced his love for language and storytelling. O Brien studied at University College Dublin, where he excelled in his studies, particularly in languages and literature.

O Brien's career in writing was multifaceted. He worked as a civil servant, which led him to publish much of his fiction under pseudonyms, the most famous being Flann O Brien. His writing is characterised by its wit, intricate plots, and the blending of reality with the surreal, often delving into the absurdities of human existence. His first novel, At Swim-Two-Birds, published in 1939, was lauded for its innovative narrative structure and metafictional elements. Despite its initial lukewarm reception, it later gained recognition as a pioneering work of postmodern literature. O Brien's other notable works include The Third Policeman (published posthumously in 1967), a darkly humorous and surreal exploration of philosophy and murder, and The Poor Mouth (1941), a satirical novel originally written in Irish.

Apart from his novels, O Brien was also known for his long-running column in The Irish Times under the pseudonym Myles na gCopaleen, where he showcased his satirical prowess and linguistic dexterity. His columns offered a scathing yet humorous critique of Irish society and politics. Flann O Brien's legacy lies in his ability to intertwine the comedic with the profound, offering a unique and influential voice in Irish literature. His works continue to be celebrated for their originality, humor, and depth, appealing to a wide range of readers and scholars interested in 20th-century literature and beyond.