Clark attended Rockdale High School in his hometown of Rockdale, Texas, where he was a letterman in football, basketball, and track. In football, he earned All-State honors and was selected as an UnderArmour All-American. In track & field, Clark was one of the states top performers in the throwing events. At the 2009 Brenham Regional Qualifier, he took bronze in both the shot put and the discus. At the 3A Regional, got 3rd in the shot put and qualified for state in the discus by placing 2nd. His personal-bests are 16.58 meters in the shot put and 55.47 meters in the discus throw.
College career
Coming in as a 4-star recruit out of high school, Clark was redshirted his freshman year in 2011. Clark started for the Red Raidersfor the first time during his redshirt freshman year at the rightguard position. He started all 13 games. For his performance during the season, Clark was named a Freshman All-American by the Football Writers Association of America and Scout.com. He earned All-Big 12 Conference honors from Phil Steele. Clark was also named an Academic All-Big 12 2nd team selection. During his sophomore year in 2013, Clark was moved to left tackle to replace All-Big 12 and current New England Patriots player LaAdrian Waddle. Prior to the beginning of the season, Clark was named a pre-season All-Big 12 selection, and was placed on the watchlists for the Outland Trophy and the Lombardi Award. Following the conclusion of the season, Clark earned Associated Press All-Big 12 1st team honors. Prior to the 2014 season, Clark was again named to the Outland Trophy and Lombardi Award watchlist. He also earned a 2nd Team All-American selection by USA Today. He was named to the Associated Press All-Big 12 1st team following the season. Following the 2015 season, Clark earned his third 1st Team All-Big 12 Conference selection, and was selected as a 2nd Team All-American by CBS Sports.
Professional career
Clark was drafted in the third round of the 2016 NFL Draft by the Indianapolis Colts. He signed with the Colts on May 25, 2016. He played in eight games with three starts as a rookie. In 2017, he played in 15 games, starting five at right guard. On March 20, 2020, Clark re-signed with the Colts.
