Mason Geertsen

Growing up in Alberta, Mason Geertsen developed his game in the province’s bantam and midget circuits with the Leduc Oil Kings and the Sherwood Park Kings before moving into major junior hockey. Edmonton selected him 18th overall in the 2010 WHL Bantam Draft, and his junior years helped shape a style built around physical defence and team-first minutes.

Colorado picked Geertsen 93rd overall in the 2013 NHL Entry Draft, launching his professional journey. He spent time in the Avalanche organization split between the AHL and ECHL, gradually carving out a niche as a stay-at-home defenceman who brings size and toughness to the lineup rather than offence.

A notable chapter came in 2016–17 when he joined the Colorado Eagles for the postseason and was part of the club’s first Kelly Cup run. After Colorado chose not to extend a qualifying offer in 2019, Geertsen attended New York Rangers camp and subsequently signed with their AHL affiliate, the Hartford Wolf Pack, where he established himself as a physical presence on the blueline and led the team in penalty minutes during the 2019–20 campaign.

Geertsen’s path continued with waivers claim by New Jersey in October 2021, and he made his NHL debut on October 19, 2021. He spent time with the Devils’ AHL and NHL affiliates, then signed with Vegas on July 1, 2023 and played with the Henderson Silver Knights. On July 1, 2025, he agreed to a two-year, two-way contract with the Buffalo Sabres and is assigned within that organization to the Rochester Americans.

Internationally, Geertsen represented Canada Pacific at the 2012 World U-17 Hockey Challenge in Windsor, appearing in five games. His game is straightforward: a defensive-minded blueliner who relies on physicality, positional play and protecting his zone rather than producing offence.