Born in New York City. His father was director-actor Fred Niblo, Sr., (1874-1948) -- one of the 36 founders of the Academy of Motion Picture Arts and Sciences -- and his mother was George M. Cohan's sister, Josephine. Niblo, Jr. entered American film as a title writer for WOMAN RACKET (1930) at MGM. He became known as a screenwriter of Hollywood action films. Other notable credits (alone or in collaboration) include THE CRIMINAL CODE (1931), CRIMINEL (1932), KING OF THE JUNGLE (1933), THE HELL CAT (1934), ESCAPE FROM DEVIL'S ISLAND (1935), THE MAN WHO LIVED TWICE (1936), MOTOR MADNESS and ALL-AMERICAN SWEETHEART (both 1937), PENITENTIARY and CITY STREETS (both 1938), HELL'S KITCHEN (1939), THE FIGHTING 69TH (1940), PASSAGE FROM HONG KONG (1941), YOU CAN'T ESCAPE FOREVER (1942), THE FALCON IN DANGER (1943), FOUR JILLS IN A JEEP and TAMPICO (both 1944), IN THIS CORNER and BODYGUARD (both 1948), INCIDENT (1949) and his last film, CONVICTED (1950).    Nominated for Writing (Adaptation) 1930-31: THE CRIMINAL CODE 1 nomination