RKO Radio Pictures’ The Pride of the Yankees ranks as one of Hollywood’s greatest sports movies. Gary Cooper stars as Lou Gehrig, the New York Yankees baseball slugger who died of ALS at age 37. Here are 21 The Pride of the Yankees movie trivia items and fun facts… 1. The Pride of the Yankees is based on the book Lou Gehrig: Pride of the Yankees by Paul Gallico (1897-1976), published by Grosset & Dunlap in 1942. Gallico also authored the novel The Poseidon Adventure (1969), which was turned into a feature length film in 1972.