Jim is the son of former Major Leaguer Jim Adduci Sr. He was born in Canada while his Dad played minor league ball. He is a Canadian resident with dual citizenship. Adduci spent the first two months of his life in Canada and, as of 2013, had never been back. However, he holds dual American and Canadian citizenship.

Jim grew up in Evergreen Park, Illinois. He attended Evergreen Park Community High School, where he was a two sport star in baseball and basketball. Adduci batted over .500 his junior season and .550 his senior season. He earned team MVP, all conference, and all area in his junior and senior seasons. He was named an all state honourable mention by both the Chicago Sun-Times and Chicago Tribune following his senior season. He committed to play college baseball for Northern Illinois during his senior year of high school.

JIm previously played in Major League Baseball (MLB) for the Detroit Tigers, Texas Rangers, and Chicago Cubs as well as the KBO League. On December 10, 2020, Adduci was hired as the run production coordinator for the Chicago Cubs.

(excerpted from Baseball Almanac, BR Bullpen & Wikipedia)