His father played collegiate football at Cornell University while his mother was an understudy for A Chorus Line on Broadway before enrolling in law school.

[3][4] Beniers was committed to play ice hockey for Harvard; however, after the Ivy League cancelled their season due to the COVID-19 pandemic, he enrolled at Michigan in August 2020.

[20][21] He had been uncertain whether he would turn professional or return to the University of Michigan for another year, but ultimately opted to sign, following discussions with his family, Kraken general manager Ron Francis, and new teammate Ryan Donato.

[25] On January 30, 2023, it was announced Beniers would miss the All-Star Game due to an injury caused by a hit from Vancouver Canucks defenceman Tyler Myers.

[29] Beniers represented the United States at the 2019 IIHF World U18 Championships, where he recorded two goals in seven games and won a bronze medal.

Beniers represented the United States at the 2021 World Junior Ice Hockey Championships, where he was the youngest player on the roster, scoring one goal and two assists and averaging 17:05 of ice time in seven games as a second-line center, helping the United States win gold.

[30] Beniers represented the United States at the 2021 IIHF World Championship, where he was the only draft-eligible player on Team USA and won a bronze medal.

[31] Beniers represented the United States at the 2022 Winter Olympics with one goal and one assist in four games and finished in fifth place.