High School - Harrington was an all-conference performer on the gridiron and won the Dan Gleason Outstanding Lineman Award as well as being named Merrimack Valley Defensive Player of the Year. He recorded over 100 tackles and seven sacks in his senior year. Harrington played at Chelmsford High School under Head Coach Bruce Rich and served as captain of both the football and basketball teams.
Personal - Born on July 26, 1994. His parents are Wendy and Michael Harrington. He has a brother, Sean Harrington. He is majoring in Graphic Design/Visual Arts. His favorite sports teams are the Patriots, Red Sox, and the Bruins. His favorite professional athlete is Julius Peppers. His favorite book is The Outsiders and favorite movie is Warrior. He enjoys Hip-Hop and his favorite TV show is Workaholics. His father is his role model.