According to Official Guinness Records,
The longest career as a game show announcer for the same show is 32 years 321 days, and was achieved by Johnny Gilbert (USA) in Culver City, California, USA, as of 28 July 2017.Johnny Gilbert is best known for the "This is Jeopardy!" announcement before each episode of the television show Jeopardy. He has been with the show since the airing of the first episode on 10 September 1984.
For a complete list of 2017 records, please visit 2017 Guinness Records in United States.