Answer by taking a quote from the following article:

Wayne was born Marion Robert Morrison on May 26, 1907 at 224 South Second Street in Winterset, Iowa. The local paper, Winterset Madisonian, reported on page 4 of the edition of May 30, 1907 that Wayne weighed 13 lbs. (around 6 kg.) at birth. His middle name was soon changed from Robert to Mitchell when his parents decided to name their next son Robert.

John Wayne won a Best Actor Oscar for True Grit (1969). This came 20 years after his only other nomination. Wayne was also nominated as the producer of Best Picture for The Alamo (1960), one of two films he directed. The other was The Green Berets (1968), the only major film made during the Vietnam War to support the war. During the filming of The Green Berets, the Degar or Montagnard people of Vietnam's Central Highlands, fierce fighters against communism, bestowed on Wayne a brass bracelet that he wore in the film and all subsequent films. Wayne took on the role of the eponymous detective in the crime drama McQ (1974). His last film was The Shootist (1976), whose main character, J. B. Books, was dying of cancer--the illness to which Wayne himself succumbed three years later. Batjac, the production company cofounded by Wayne, was named after the fictional shipping company Batjak in Wake of the Red Witch (1948), a film based on the novel by Garland Roark. (A spelling error by Wayne's secretary was allowed to stand, accounting for the variation.) Batjac (and its predecessor, Wayne-Fellows Productions) was the arm through which Wayne produced many films for himself and other stars. Its best-known non-Wayne productions were Seven Men From Now (1956), which started the classic collaboration between director Budd Boetticher and star Randolph Scott, and Gun the Man Down (1956) with contract player James Arness as an outlaw. In the Motion Picture Herald Top Ten Money-Making Western Stars poll, Wayne was listed in 1936 and 1939. He appeared in the similar Box Office poll in 1939 and 1940. While these two polls are really an indication only of the popularity of series stars, Wayne also appeared in the Top Ten Money Makers Poll of all films from 1949 to 1957 and 1958 to 1974, taking first place in 1950, 1951, 1954, and 1971. With a total of 25 years on the list, Wayne has more appearances than any other star, surpassing Clint Eastwood (21) who is in second place. In later years, Wayne was recognized as a sort of American natural resource, and his various critics, of his performances and his politics, viewed him with more respect. Abbie Hoffman, the radical of the 1960s, paid tribute to Wayne's singularity, saying, "I like Wayne's wholeness, his style. As for his politics, well--I suppose even cavemen felt a little admiration for the dinosaurs that were trying to gobble them up." Reviewing The Cowboys (1972), Vincent Canby of The New York Times, who did not particularly care for the film, wrote: "Wayne is, of course, marvelously indestructible, and he has become an almost perfect father figure".

what did he do later in his career?
John Wayne won a Best Actor Oscar for True Grit (1969).