Who was one of the best-known U.S. artists of the middle 20th century and was the subject of  a 2013 British documentary film directed by Eleanor Yule? 
Michael Palin in Wyeth's World:  It is about the American painter Andrew Wyeth and the people who inspired his paintings. Andrew Wyeth: Andrew Newell Wyeth ( ; July 12, 1917 – January 16, 2009) was a visual artist, primarily a realist painter, working predominantly in a regionalist style.
Andrew Wyeth