Anthony Daniels (born February 21, 1946) is an English actor and mime artist, best known for playing C-3PO in 10 Star Wars films. He is the only actor to have either appeared in or been involved with all theatrical films in the series, and has been involved in many of their spin-offs, including television series, video games, and radio serials.
Description above from the Wikipedia article Anthony Daniels, licensed under CC-BY-SA, full list of contributors on Wikipedia.