Green, 6-foot-2, 193 pounds, played in 29 games during his junior year with the Cornell University of the ECAC in 2019-20, recording seven goals and 16 points. He was named the conference's best defensive defenseman and was selected to the All-ECAC Hockey third team. Green's plus-20 rating was tied for the team lead and tied for tops in all of ECAC Hockey among all blue-liners.
The Chicago, Illinois native has played in 78 games for Cornell during the previous three seasons. During that time, he has accumulated 10 goals and 30 points with a plus-23 rating. Prior to committing to Cornell, Green spent three seasons playing in the USHL with Lincoln and Muskegon.
Green was drafted by the Lightning in the fourth round, 121st overall, of the 2018 NHL Draft.