Donald Leroy "Don" LaFontaine (August 26, 1940 - September 1, 2008) was an American voiceover artist famous for recording more than 5,000 film trailers and hundreds of thousands of television advertisements, network promotions, and video game trailers. His nicknames included "Thunder Throat" and "The Voice of God". He became identified with the phrase "In a world…", which has been used in movie trailers so frequently that it has become a cliché. He parodied his career several times, most recently in commercials for GEICO insurance, an episode of the Dan Povenmire-created Phineas and Ferb, and the Mega Millions lottery game.
LaFontaine passed away at the age of 68 following complications from pneumothorax.