Disillusioned with acting at the age of 20, Fields embarked on a cross-country trip to learn to play guitar. With no formal training in music, he learned and sat in with musician friends. He later played in rock bands The Image Innate, Concrete Haven, The Just and Humble Kings, and The Hudson River Band. In 2004, he played in cover bands Sonic Sister and Double Clutch. In 2005, Fields formed Led Blimpie, a Led Zeppelin tribute band.

In 1980, Fields was cast as Tom of Warwick in the 20th Anniversary revival production of Camelot starring Richard Burton, Christine Ebersole and Richard Muenz. This production toured the United States, breaking world records for attendance, and also played at Lincoln Center’s State Theater in New York City. After the curtain calls at the company’s final performance in Chicago, Burton announced to the audience that it was Thor’s birthday. The audience sang “Happy Birthday”, and Burton called for the sword Excalibur to be brought to him. On being informed that the sword Excalibur was already packed away, he said: “With this… hand… I dub thee Sir Thor.” In 1981, Burton was replaced by Richard Harris. Fields and the production continued to tour as well as play Broadway’s Winter Garden Theatre, where it was filmed for HBO.

Fields made his Broadway debut in The King and I in 1978. This was the first revival starring Yul Brynner and Constance Towers. Fields was understudy for the role of Louis (the teacher’s son) and also swing for the Royal Children (wearing a black wig and full body make-up so as to appear Siamese). Fields was also in the Turgenev play A Month in the Country (Roundabout Theater Company) starring Tammy Grimes, Farley Granger and Amanda Plummer.

Fields played the role of Erich Aldrich on the NBC soap opera The Doctors from 1977 until 1980. In 1981, he appeared with Carroll O’Connor in an episode of Archie Bunker’s Place and in 1983 played Jasper Kent in Horatio Alger Updated: Frank and Fearless (ABC). On the big screen, Fields played Danny, Shelley Long’s son in Hello Again, and appeared in the film Misplaced starring John Cameron Mitchell.

Fields got his start in show business at the age of 18 months in a commercial for Pampers, filmed in 1971, in which he was one of the last people to ride the carousel at the amusement park at Palisades Park. During the mid-1970s, Fields appeared in over 50 commercials, including an ad for Thomas’ English Muffins in which he slid down a stairway banister shouting, “Auntie Mabel, Auntie Mabel, put some Thomas’ on the table!” He also appeared in the first commercial for Glow Lite Lite Ups (glow sticks), which won an award at the Cannes Film Festival.

Thor Fields (September 19, 1968) is an American actor and guitarist.