Kenneth George Baker (born August 24, 1934) is a British dwarf actor best known as the man inside of R2-D2 in the popular "Star Wars" film series. Baker, who stands 3 feet, 8 inches (112 cm) tall, was a circus and cabaret performer with entertainer Jack Purvis when George Lucas hired him to be the man inside R2-D2 in "Star Wars" in 1977. Baker appears in five of the six "Star Wars" films; though credited on Episode III, he never filmed any scenes. Wikipedia
The definitive Wikipedia entry for Kenny Baker. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Kenny_Baker