He appeared in many television programs, including The Untouchables, Batman, Gunsmoke, Mission: Impossible, Mary Hartman, Mary Hartman, Star Trek, Get Smart, The Rockford Files, Charlie's Angels, Fantasy Island, Buck Rogers in the 25th Century, The Dukes of Hazzard, The A-Team, MacGyver, and Emergency!.

[8] Haig was also a musician, playing a wide range of music styles on the drums, including swing, country, jazz, blues and rock and roll.

[7][9][10] While Haig was in high school, the head of the drama department was Alice Merrill, who encouraged him to pursue an acting career.

Two weeks later, he returned to see the show and advised Haig to continue his education in the San Fernando Valley and to consider acting as a career.

Two years later, Haig enrolled in the Pasadena Playhouse,[8] the school that trained such noted actors as Robert Preston, Gene Hackman, and Dustin Hoffman.

[15] He also appeared in a number of other television programs, including Batman, The Man from U.N.C.L.E., Gunsmoke, Mission: Impossible,[16] Star Trek,[15] Get Smart,[13] The Flying Nun,[15] Mary Hartman, Mary Hartman, Emergency!, Charlie's Angels,[16] Jason of Star Command, Fantasy Island,[17] Buck Rogers in the 25th Century,[15] The Dukes of Hazzard,[16] The A-Team,[13] MacGyver, and Just the Ten of Us.

[7] During this time, he was offered the role of Marsellus Wallace (later to be played by Ving Rhames) in Pulp Fiction, the second feature film directed by Quentin Tarantino.

[18][19] At the time, Haig was concerned that low-budget television had been detrimental to his career and, at seeing the shooting script and the short number of days dedicated for each locale, he reportedly passed on the project; he is said to have later regretted this decision.

[7][22] In 2003, Haig starred in Rob Zombie's debut film House of 1000 Corpses, as a psychotic clown named Captain Spaulding.

[31] In 2019, Haig appeared as Captain Spaulding for the final time in the Rob Zombie film 3 from Hell, a sequel to House of 1000 Corpses and The Devil's Rejects.