Zack joined NMH in 2016 as a math teacher as well as coach. In his first season, the team had a 14-3 dual meet record, placed 2nd at the Class A tournament, and 3rd at the NEPSAC tournament, and 20th at the National Prep Tournament; and Zack was named the Massachusetts Prep Coach of the Year by the National Wrestling Hall of Fame. He also received NMH’s Housen Coaching Award as the male coach of the year.

Before coming to NMH, Zack coached varsity wrestling at Lawrence Academy in Groton, Mass. He wrestled for Bridgewater State University, where he was a four-time All-League selection, three-time team captain, two-time conference finalist, two-time winner of the Scholar All-America Award, and was ranked ninth nationally. In his senior season, he reached the century mark in wins (101) and was named the Pilgrim League’s Wrestler of Year and Bridgewater State's athlete of the year.