Marissa Gedman attended Noble and Greenough School where she participated in field hockey, ice hockey, and softball. In her 2008 season, she achieved All-League ISL, a NE Championship, and 16-U National Championship in Ice Hockey. She went on to attend Harvard University starting in 2010, and played for the women's ice hockey team, accumulating 75 points with the Harvard Crimson women's ice hockey program. For the 2015-16 season, she was a member of the Boston Pride of the NWHL and participated in the 2016 Outdoor Women's Classic, the first outdoor professional women’s hockey game.