Flann O'Brien, the pen name of Brian O'Nolan (1911-1966), was an innovative Irish novelist and satirist renowned for his inventive use of language and blending of genres. His best-known works include "At Swim-Two-Birds" and "The Third Policeman," which showcase his wit, dark humor, and penchant for metafiction. O'Brien also wrote a popular column in "The Irish Times" under the pseudonym Myles na gCopaleen, enlivening readers with his biting satire and keen social commentary. A master of the absurd and surreal, O'Brien's distinctive voice has had a lasting impact on Irish literature, influencing writers such as Samuel Beckett and James Joyce.