Brian O'Nolan, also known by his pen name Flann O'Brien, was an Irish novelist and playwright born on October 5, 1911. He is best known for his works that blend humor, absurdity, and social commentary, particularly in novels like At Swim-Two-Birds and The Third Policeman. O'Nolan's writing often reflects his background in Irish culture and literature. In addition to his novels, O'Nolan wrote a popular column for the Irish Times under the pseudonym Myles na gCopaleen. His unique style and innovative narrative techniques have made him a significant figure in 20th-century literature, influencing many writers and earning him a dedicated readership.