For this chain-of-thought reasoning and answer, what was the question?
The relevant information to answer the above question is: He came to prominence in 1939 playing Beau Wilkes in Gone with the Wind.
A: Theodore Matthew Michael Kuhn , Jr.
Q: Theodore Matthew Michael Kuhn, Jr. (born September 21, 1932), known as Mickey Kuhn, is an American former child actor of the 1930s, 1940s and 1950s. He came to prominence in 1939 playing Beau Wilkes in Gone with the Wind.

Based on this passage, who played beau in gone with the wind?