Anthony Daniels
Anthony Daniels (born February 21, 1946) is an English actor and mime artist, best known for playing C-3PO in 11 Star Wars films (every film of the Skywalker saga, Rogue One and The Clone Wars theatrical film). 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.
Known for
Star Wars: Episode VII - The Force Awakens 
Star Wars: Episode VIII - The Last Jedi 
The Lego Movie 
Star Wars: Episode IV - A New Hope 
Star Wars: Episode V - The Empire Strikes Back 
Star Wars: Episode VI - Return of the Jedi 
Star Wars: Episode I - The Phantom Menace 
Star Wars: Episode III - Revenge of the Sith 
Star Wars: Episode IX - The Rise of Skywalker 
Star Wars: The Clone Wars 
The Lord of the Rings 
The Lego Star Wars Holiday Special 
The Star Wars Holiday Special 
Robot Chicken: Star Wars III 
Empire of Dreams: The Story of the 'Star Wars' Trilogy 
Lego Star Wars Summer Vacation 
I Bought a Vampire Motorcycle 
The Skywalker Legacy