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He is the third son of Livingston and Barbara Theriot of Golden Meadow in Lafourche Parish. He and his wife, the former Veronica Gautreaux, a nurse for the Cardiovascular Institute of the South. The couple has three children, Stuart, Tyler, and Emilee Theriot.<ref>{{cite web|url=https://web.archive.org/web/20121119062709/http://mitchtheriotforjudge.com/endorsements.html|title=Get to Know Mitch|publisher=Mitchtheriotforjudge.com|accessdate=April 4, 2020}}</ref>

He is the third son of Livingston and Barbara Theriot of Golden Meadow in Lafourche Parish. He and his wife, the former Veronica Gautreaux, a nurse for the Cardiovascular Institute of the South. The couple has three children, Stuart, Tyler, and Emilee Theriot.<ref>{{cite web|url=https://web.archive.org/web/20121119062709/http://mitchtheriotforjudge.com/endorsements.html|title=Get to Know Mitch|publisher=Mitchtheriotforjudge.com|accessdate=April 4, 2020}}</ref>

In 2012, he was elected to the First Circuit Court of Appeals, District 1, Division B for a term of ten years. Still a Republican, Theriot led in the primary on November 6, 2012, with 33.66 percent of the vote. Theroit then defeated Democrat William Dupont in the runoff election on December 8, 25,793 (53 percent to 22,783 (47 percent). with 53.1 percent of the ballots cast.<ref>{{cite web|url=https://ballotpedia.org/Mitch_Theriot|title=Mitch Theriot|publisher=Ballotpedia|accessdate=April 4, 2020}}</ref><ref>Louisiana Secretary of State, Election Returns, December 8, 2012.</ref>  

In 2012, Theriot was elected to the First Circuit Court of Appeals, District 1, Division B for a term of ten years. Still a Republican, Theriot led in the primary on November 6, 2012, with 33.66 percent of the vote. Theroit then defeated Democrat William Dupont in the runoff election on December 8, 25,793 (53 percent to 22,783 (47 percent). with 53.1 percent of the ballots cast.<ref>{{cite web|url=https://ballotpedia.org/Mitch_Theriot|title=Mitch Theriot|publisher=Ballotpedia|accessdate=April 4, 2020}}</ref><ref>Louisiana Secretary of State, Election Returns, December 8, 2012.</ref>  

He elected to the legislature in 1991 to succeed Jessie P. Guidry, a Democrat. He won again in 1995. In the 1999 nonpartisan blanket [[primary]] for the legislature, Theriot was unseated after two terms in office by the Republican (later [[Independent voter|Independent]]) Loulan J. Pitre, Jr., an attorney who was born in 1961 in Cut-Off in Lafourche Parish. Pitre polled, 7,187 votes (51.5 percent) to  6,768 (48.5 percent).<ref>Louisiana Secretary of State, Election Returns, October 23, 1999.</ref> In 2003, Pitre again defeated Theriot by nearly the same total as he had in 1999, 7,618 (votes 52 percent) to 7,035 (48 percent).<ref>Louisiana Secretary of State, Election Returns, October 4, 2003.</ref> When Pitre declined to  seek a third term in 2007, Theriot ran to reclaim the seat after an eight-year absence, but after his party switch, he lost to the Democrat Jerry "Truck" Gisclair of Larose in Lafourche Parish, a businessman and radio station broadcaster.  

He elected to the legislature in 1991 to succeed Jessie P. Guidry, a Democrat. He won again in 1995. In the 1999 nonpartisan blanket [[primary]] for the legislature, Theriot was unseated after two terms in office by the Republican (later [[Independent voter|Independent]]) Loulan J. Pitre, Jr., an attorney who was born in 1961 in Cut-Off in Lafourche Parish. Pitre polled, 7,187 votes (51.5 percent) to  6,768 (48.5 percent).<ref>Louisiana Secretary of State, Election Returns, October 23, 1999.</ref> In 2003, Pitre again defeated Theriot by nearly the same total as he had in 1999, 7,618 (votes 52 percent) to 7,035 (48 percent).<ref>Louisiana Secretary of State, Election Returns, October 4, 2003.</ref> When Pitre declined to  seek a third term in 2007, Theriot ran to reclaim the seat after an eight-year absence, but after his party switch, he lost to the Democrat Jerry "Truck" Gisclair of Larose in Lafourche Parish, a businessman and radio station broadcaster.