John Forbes Nash Jr. (1928-2015) was an economist, a mathematician, and one of the inventors of the game of Hex.
Nash was the subject of the bestselling book A Beautiful Mind. In 2001, the book was made into a movie starring Russell Crowe as Nash; the movie was highly successful and won several Academy Awards, including Best Picture. (source)
A long and interesting interview with Dr Nash (some video clips as well):