Campbell began his business career while still a student at Texas Tech, founding a small real estate company with his childhood friend, football teammate, and future Double Eagle co-founder John Sellers. The duo named their company “Double Eagle” in homage to the hometown high school mascot. Over time, the pair built an operating team, and began drilling their own wells, eventually moving into highly technical horizontal drilling. This joint venture with Apollo, called Double Eagle Energy Holdings, was sold to Aubrey McClendon's American Energy Non-Op in November 2014. In 2015, Sellers and Campbell formed Double Eagle Energy Holdings II. The company was sold to Parsley Energy in 2017. The pair merged their company with FourPoint Energy to create Double Point Energy in 2018, which sold to
Pioneer Natural Resources in April 2021. In 2022, Campbell and Sellers subsequently formed Double Eagle Energy Holding IV, this time in partnership with Encap Energy Capital. The company accumulated a large acreage position once again in the Midland Basin before selling to Diamondback Natural Resources in February 2025. In addition to Double Eagle, Sellers and Campbell are also CEOs and co-founders of Tumbleweed Royalty, which is a large mineral and royalty acquisition company that operates across the United States. Tumbleweed Royalty IV was sold to Viper Energy Inc. in September 2024. == Texas Tech University ==