Jonas Siegenthaler Bio
Jonas Siegenthaler is a Swiss professional ice hockey player who plays as a defenceman for the New Jersey Devils of the National Hockey League (NHL). Born on May 6, 1997, in Zürich, Switzerland, he is recognized for his size, defensive reliability, and growing offensive contributions from the blue line. He made his NHL debut in 2018 after being selected 57th overall in the 2015 NHL Entry Draft by the Washington Capitals, and he has since developed into a key piece of the Devils roster following a trade in 2021. Standing 188 cm tall and weighing 99 kg, he combines physical presence with the skating ability demanded by today’s game.
Early Life and Background
Jonas Siegenthaler was born on May 6, 1997, in Zürich, Switzerland. His father is Swiss, while his mother is from Thailand, a heritage that has been noted in hockey circles. He holds dual cultural roots that shaped his upbringing in Switzerland’s largest city, where he was introduced to ice hockey at a young age through the country’s strong youth development system.
Growing up in Zürich gave Siegenthaler access to one of the country’s most respected hockey programs, and he progressed steadily through the junior ranks. His size and maturity quickly set him apart from peers his age, allowing him to compete against older players. By his mid-teens, he was already being scouted as a top prospect for the NHL Entry Draft.
While his family’s deep sporting background has not been publicly documented, his parents supported his move into competitive hockey from an early age. The structured environment at the ZSC Lions organization helped him refine the defensive fundamentals that would later define his professional style. His progression through Swiss junior hockey laid the foundation for his transition to North America.
Path to Hockey
Siegenthaler’s path to professional hockey began with the ZSC Lions, one of the most storied franchises in Swiss ice hockey. He made his National League A debut with the club during the 2013–14 season at just 16 years old, gaining top-level experience while continuing to develop physically and tactically. His poise and defensive awareness drew the attention of NHL scouts tracking European prospects.
Heading into the 2015 NHL Entry Draft, Siegenthaler was rated as a top prospect and projected as a possible first-round selection. The Washington Capitals ultimately selected him 57th overall, a pick that reflected both his potential and the depth of that draft class. Shortly after the draft, on July 30, 2015, he signed a three-year entry-level contract with the Capitals.
Rather than jump directly to North America, Siegenthaler remained on loan with the ZSC Lions for the 2015–16 season to continue his development. He recorded eight points in 40 games from the blue line before the Lions were eliminated in the first round of the postseason. That experience prepared him for the next stage of his career in the American Hockey League with the Hershey Bears.
Jonas Siegenthaler Career
Early Career (2013–2018)
After his loan with the ZSC Lions ended following the 2015–16 season, Siegenthaler was reassigned to the Hershey Bears, the Capitals’ AHL affiliate, on March 16, 2016. He split the following season between the Lions and Hershey, returning to the Bears in mid-March 2017 after the Lions were eliminated in the NLA quarterfinals. These years in the AHL allowed him to adjust to the North American style of play and the smaller rink dimensions.
During his time in the AHL, Siegenthaler refined his defensive game and added strength to his 188 cm frame. He also gained valuable playoff experience and grew into a dependable two-way defenceman. By the fall of 2018, the Capitals organization viewed him as ready for an opportunity at the NHL level.
Washington Capitals Debut (2018–2021)
The Capitals recalled Siegenthaler from Hershey on November 8, 2018, and he made his NHL debut the following night against the Columbus Blue Jackets at home. The opportunity arose because veteran defencemen Brooks Orpik and John Carlson were both unavailable to play, thrusting the 21-year-old into the lineup.
Siegenthaler scored his first NHL point on December 14, 2018, recording the primary assist on a goal by Alexander Ovechkin in a 6–5 win over the Carolina Hurricanes. He went on to spend parts of three seasons in the Capitals organization, developing into a steady bottom-pairing option and penalty-killing specialist. His poise under pressure earned him a consistent role in Washington.
Approaching the 2021 NHL trade deadline, the Capitals dealt Siegenthaler to the New Jersey Devils on April 11, 2021, in exchange for a conditional third-round pick in the 2021 NHL Entry Draft. The move gave him a fresh start and an opportunity to take on a larger role with a young, ascending Devils roster.
New Jersey Devils Era (2021–Present)
Following his trade to New Jersey, Siegenthaler quickly became part of the Devils’ long-term plan. On July 9, 2021, he signed a two-year, $2.25 million contract extension to remain with the team. Less than a year later, on July 26, 2022, the Devils committed to him further with a five-year, $17 million contract extension that runs through the 2026–27 season.
Since joining the Devils, Siegenthaler has been a fixture on the team’s top defensive pair, logging heavy minutes in all situations. He pairs a physical, hard-to-play-against style with a steady first pass out of the defensive zone. His play has been a key reason the Devils returned to playoff contention after years of rebuilding.
The 2023–24 season tested Siegenthaler’s durability. On January 6, 2024, he suffered a broken foot while blocking a shot against the Vancouver Canucks and was later placed on injured reserve. He was removed from injured reserve on February 20, 2024, but on March 11, 2024, he was elbowed by New York Rangers forward Matt Rempe, forcing him out of that game. Rempe was suspended four games for the hit, and on March 13, 2024, the Devils announced that Siegenthaler had been diagnosed with a concussion that kept him out for an extended period.
Notable Events and Milestones
One of the most significant milestones in Siegenthaler’s career came internationally when he represented Switzerland at the 2024 IIHF World Championship and won a silver medal. He also earned recognition as a top young Swiss prospect, having been named to the 2015 U18 World Junior Championship All-Star Team and representing Switzerland at multiple IIHF events at the under-18 and World Junior levels.
Jonas Siegenthaler Family
Personal Life
Jonas Siegenthaler was born to a Swiss father and a Thai mother, a heritage that has been publicly noted in hockey media. He is widely recognized as the first known NHL player of Thai descent, a distinction that has drawn attention to his multicultural background. He has largely kept his personal and family life private, focusing publicly on his professional career with the New Jersey Devils.
2025 Season Performance
Entering the 2025 season, Jonas Siegenthaler is firmly established as a top-pair defenceman for the New Jersey Devils under a long-term contract that runs through 2027. Coming off a 2023–24 campaign interrupted by a broken foot and a concussion, he is expected to return to full health and reassert himself as one of the league’s most reliable defensive defencemen. His pairing with another top blueliner gives the Devils one of the more balanced defensive groups in the Eastern Conference.
For the Devils, the 2025 season carries significant playoff expectations after several years of growth around a young core. Siegenthaler’s ability to log top-four minutes, kill penalties, and contribute offensively from the back end will be central to those ambitions. His continued partnership with the team’s goaltending and his role on the penalty kill make him a stabilizing presence game in and game out.
Beyond the NHL, Siegenthaler remains a candidate for international duty with Switzerland, where his experience from the 2024 IIHF World Championship silver medal run could position him for further national team opportunities. A healthy and productive 2025 campaign would reinforce his status as one of the premier Swiss defencemen in the NHL and a cornerstone of the Devils’ long-term plans.