Thomas Duane Arnold (born March 6, 1959) is an American actor and comedian. He is best known for Arnie Thomas on Roseanne (1989-1993), Jackie Thomas on The Jackie Thomas Show (1992-1993), and Tom Amross on The Tom Show (1997-1998).He has appeared in several films, including True Lies (1994), Nine Months (1995), McHale's Navy (1997), Animal Factory (2000), Cradle 2 the Grave (2003), Mr. 3000 (2004), Happy Endings (2005), The Great Buck Howard (2008), and Madea's Witness Protection (2011). He was also the host of The Best Damn Sports Show Period for four years, and appeared on Sons of Anarchy.
Arnold met comedian Roseanne Barr when she saw his act in 1983. Their relationship was complicated by his alcoholism and drug addiction, but eventually he became sober. The two married in 1990 and divorced in 1994. In an April 2009 interview on Anytime with Bob Kushell, Arnold discussed why when he divorced Barr, he did not take any alimony. During the next ten years, Arnold married two subsequent times. Both marriages ended in divorce. In August 2008, Arnold broke his scapula in a motorcycle accident on the Pacific Coast Highway.Over Thanksgiving weekend 2009, Arnold married his fourth wife, Ashley Groussman, in Maui before 75 guests. Dax Shepard served as Arnold's best man. He appeared December 10, 2009 on the late night talk show Asia Uncut. The couple have two children and four dogs. In January 2019, the couple announced their intention to divorce. The divorce was finalized in July 2020.Arnold was raised a Methodist. Some sources say he converted to Judaism upon marrying Roseanne Barr in 1990, but in a podcast interview with Andrew Santino he speaks of growing up Jewish in Iowa. He still practices Judaism.
Arnold was born Thomas Duane Arnold in Ottumwa, Iowa, the son of Linda Kay (née Graham) and Jack Arnold. He has six siblings. As a child, Arnold was diagnosed with autism. His mother abandoned the family when he was a child, and he and his siblings were raised by their father.During his youth, he worked at a meatpacking plant. He attended Ottumwa High School, Indian Hills Community College, and the University of Iowa from 1981 to 1983, where he studied business administration and writing.