Paul Julian

Paul Julian (June 25, 1914 – September 5, 1995) was an American background animator, sound effects artist and voice actor for Warner Bros. Cartoons. He worked on Looney Tunes short films, primarily on director Friz Freleng's Sylvester and Tweety Bird shorts. During his time at Warner, Julian provided the vocal effects of the Road Runner.

[biography (excerpted) from Wikipedia]