The first American author to win the Man Booker Prize is Paul Beatty for his book The Sellout – a biting satire on race relations in the United States.
Here is the SMH article: http://www.smh.com.au/entertainment/books/man-booker-prize-goes-to-american-paul-beatty-for-racerelations-satire-the-sellout-20161025-gsamw4.html
And more in The Guardian: https://www.theguardian.com/books/2016/oct/25/paul-beatty-wins-man-booker-prize-2016