Hiroshi Naka
From Transformers Wiki
Hiroshi Naka (中博史, Naka Hiroshi born November 19, 1960) is a Japanese voice actor. Some of his most notable anime roles include Enma from Naruto, Monkey D. Garp from One Piece, Wang Chan from JoJo's Bizarre Adventure, Doc from Hellsing: Ultimate, South Kai from Dragon Ball Kai, Gambuta from Naruto Shippuden, Techs Farzenbarg in After War Gundam X, and Draq from F-Zero: GP Legend.
In terms of dubbing, he voiced The Doctor on Star Trek: Voyager, The King of the Royal Flush Gang on Batman Beyond, Professor Milo on Batman: The Brave and the Bold, Dr. Zalost on Courage the Cowardly Dog, Dr. Emil Hamilton on Man of Steel and... Mark Hamill on that one episode of The Simpsons he guest starred in.
Roles
The Transformers
Naka portrayed these characters only for the Japanese dub of The Rebirth, which was released in Japan under the American The Transformers branding to distinguish it from the continuity of the Japanese Fight! Super Robot Lifeform Transformers.