Born and raised in Irvine, California, Romney began his professional career with LA Galaxy II, having previously played in the U.S. Soccer Development Academy with the Irvine Strikers[6] as well as the University of San Francisco men's soccer team and amateur club San Francisco City FC. He made his USL debut against Sacramento Republic FC in March 2015.[7] He became the first LA Galaxy II player to sign a MLS contract when he was signed by LA Galaxy on August 5, 2015.[8]
Romney was re-signed by the LA Galaxy at the beginning of the 2019 season.[9]
On November 12, 2019, Romney was traded to Nashville SC ahead of their inaugural season in MLS. LA Galaxy received $225,000 in General Allocation Money and will receive an additional $50,000 in General Allocation Money if Romney meets certain performance-based metrics.[10]
On January 5, 2023, Romney was traded to New England Revolution in exchange for a total of $525,000 in General Allocation Money.[11] Romney scored his first goal for the Revolution in Major League Soccer play on September 30, 2023, in a 2–1 victory over Charlotte FC.[12]
On October 21, 2023, Romney became only the second player in New England Revolution history to play every minute of a 34-game season, the first being José Gonçalves.[13] Romney was also the only outfield player to play every minute of the 2023 MLS regular season.[13] He was named Revolution team defender of the year for the 2023 season,[14] and again for the 2024 season.[15]
Romney, along with teammates Mark-Anthony Kaye and Ian Harkes, were traded to the San Jose Earthquakes on December 2, 2024 for "around" $500,000 General allocation money and an international roster spot, reuniting Romney with his former Revolution and Galaxy manager Bruce Arena.[5][4]