Thurl Arthur Ravenscroft (February 6, 1914 – May 22, 2005) was an American voice actor and basso profundo best known as the deep voice behind Tony the Tiger's "They're grrreat!" in Kellogg's Frosted Flakes television commercials for more than five decades. Ravenscroft was also known, albeit uncredited, as the vocalist for the song "You're a Mean One, Mr. Grinch" from the classic Christmas television special, Dr. Seuss' How the Grinch Stole Christmas!.
Ravenscroft did some voice-over work and singing for Disney in both the films and the attractions at Disneyland (which were later featured at Disney World). The most well known of these attractions are The Haunted Mansion, The Country Bear Jamboree, The Mark Twain Riverboat, The Pirates of the Caribbean and Walt Disney's Enchanted Tiki Room. His voice acting career began in 1940 and lasted until his death in 2005 at age 91.
Ravenscroft was married to June Ravenscroft in 1946, they had two children. June died in 1999 from unknown causes. Ravenscroft semi-retired and didn't job at any other studio anymore but continued to voice Tony The Tiger through 2004 with limo transportation by Kellogg's and sometimes from his apartment home, and also submitted to an interview that year by the Disney "Extinct Attractions Club" website. He died in his home on May 22, 2005 from prostate cancer. He was survived by his two children, Ron Ravenscroft and Nancy Ravenscroft. He was buried at the Memorial Gardens at the Crystal Cathedral in Garden Grove, California.