After attending several conventions, and having written letters to many of the cast- and crewmembers of Star Wars, I myself (skywalker8) have collected quite a bit of autographs, too. All, with the exception of Samuel L. Jackson, are authentic.

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Main Stars: C-3PO: Anthony Daniels R2-D2: Kenny Baker Princess Leia: Carrie Fisher Luke Skywalker: Mark Hamill Darth Vader (body): David Prowse Darth Vader (voice): James Earl Jones Chewbacca: Peter Mayhew Wedge Antilles (Red 2): Denis Lawson A New Hope: Garven Dreis (Red Leader): Drewe Henley Biggs Darklighter (Red 3): Garrick Hagon John D. (Red 4): Jack Klaff Chief Bast: Leslie Schofield Uncle Owen Lars: Phil Brown Aunt Beru Lars: Shelagh Fraser Empire Strikes Back: Emperor Palpatine (voice): Clive Revill Captain Needa: Michael Culver Admiral Piett: Kenneth Colley Lobot: John Hollis Wampa (Special Edition): Howie Weed Boba Fett: Jeremy Bulloch Dak Ralter: John Morton Major Derlin: John Ratzenberger Wyron Serper (Hoth head controller): Jerry Harte Cal Alder: Jack McKenzie Admiral Ozzel: Michael Sheard General Veers: Julian Glover Bespin Guard (uncredited): Treat Williams Return of the Jedi: Wicket W. Warrick Warwick Davis Mon Mothma: Caroline Blakiston General Crix Madine: Dermot Crowley Oola: Femi Taylor Hermi Odle: Philip Herbert Bib Fortuna: Michael Carter Malakili, the Rancor Keeper: Paul Brooke Rystall Mercedes Ngoh Ewok Felix Silla The Phantom Menace: Jar Jar Binks: Ahmed Best Captain Panaka: Hugh Quarshie Anakin Skywalker: Jake Lloyd Obi-Wan Kenobi: Ewan McGregor Shmi Skywalker: Pernilla August Darth Maul: Ray Park Mace Windu: Samuel L. Jackson Chancellor Valorum: Terence Stamp Holiday Special: Ackmena: Bea Arthur Trader Saundan: Art Carney Krelman, Chef Gormaanda, Amorphian Instructor: Harvey Korman Miscellaneous: Episode I novel author: Terry Brooks LucasArts voices, Wicket in Ewoks cartoons, Stormtrooper: Denny Delk Music Composer: John Williams Visual Effects Supervisor: John Knoll Prequel Producer: Rick McCallum Creature Design (ROTJ), Stop Motion Animation (also Sy Snootles in ROTJ, Myo + Node member in ANH): Phil Tippett Conceptual Artist: Ralph McQuarrie