Klingberg started his career at an early age in Lerums BK; he was then signed as a youth to join the Frölunda HC program. He made his Elitserien debut for Frölunda HC on 21 September 2010, against AIK. On 16 May 2011, the Dallas Stars announced that they had signed Klingberg to a three-year entry level contract. He was then loaned to the FinnishSM-liiga to play with Jokerit in the 2011–12 season before returning to Sweden midway through the campaign to Skellefteå AIK. In the 2013–14 season, Klingberg opted to play on loan with Frölunda HC, and produced a career high 11 goals and 28 points in 50 games. After post-season elimination, Klingberg was assigned to the Stars' American Hockey League affiliate, the Texas Stars, and played in three regular season games. In his first full North American season in 2014–15, Klingberg remained with Texas to begin the year. After being recalled by the Stars, he made his NHL debut in a 4–3 victory over the Arizona Coyotes on 11 November 2014. Klingberg scored his first NHL goal on 20 November 2014, against Mike Smith of the Arizona Coyotes. Klingberg finished first in points among all rookie defenceman in 2014–15 and was named to the NHL all-rookie team. The Stars qualified for the 2016 Stanley Cup playoffs. They defeated the Minnesota Wild in the first-round before falling to the St. Louis Blues in the second. Overall, Klingberg recorded one goal and three assists in 13 games. After ranking first among NHL defencemen, Klinberg was named to the 2018 NHL All-Star Game, along with teammate Tyler Seguin. He finished the year with a career-high 67 points in 82 games. On 9 November 2018, Klingberg underwent hand surgery, sidelining him for at least four weeks. He returned on 20 December in a 5-2 loss to the Chicago Blackhawks. Despite missing a total of 18 games, Klingberg recorded ten goals and 45 points. During the Stars' first-round match-up against the Nashville Predators in the 2019 Stanley Cup playoffs, Klingberg scored the series-winning overtime goal in game six to advance.
Personal life
Klingberg was born in Gothenburg, Sweden, to Anders Klingberg. His father, Anders, is also active in hockey and is a head coach for Göteborg during TV-pucken, a Swedish ice hockey tournament. Klingberg also has two brothers, both of whom are active hockey players; Carl who currently plays for EV Zug of the National League and Olle, who currently plays with Lerums BK.
