|Birth Day:||August 14, 1992|
|Birth Place:||Gothenburg, Sweden|
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He spent his early years with Lerums BK and later joined the Frölunda HC youth system.
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 Finnish SM-liiga to play with Jokerit in the 2011–12 season before returning to Sweden midway through the campaign to Skellefteå AIK.
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.
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.
Currently, John Klingberg is 30 years, 3 months and 22 days old. John Klingberg will celebrate 31st birthday on a Monday 14th of August 2023.
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