Westmeath, Ireland, and now currently lives in Brighton, England, though he hasn't done a house tour because he has had trouble with fans going to his house, which makes it unclear if he lives in an office, house or apartment.
In a previous apartment, Jack had a roommate named Killian, and he even appeared in some of his videos, including a vlog and a Turbo Dismount video.
Jack's friend and editor is Robin, or pixlpit as his online alias.
Robin has appeared in a Worms Clan Wars video as a secondary player, in "Oh Sir...!
Despite his overwhelming popularity, Jack has remained down to earth.
He hasn't let his popularity go to his head, and admits that he doesn't describe himself as a "celebrity" or "famous," as those terms make him feel uncomfortable.
Robin is the skills behind the Antisepticeye edits, and Jack has publicly thanked him many times for it.
The fanbase created an "evil" Jack, calling him "Antisepticeye." Jack, liking the idea, enlisted Robin's help to add in little glitch edits to his videos to build up the eventual Say Goodbye video on Halloween of 2016.
As of November 2015, Signe moved in with Jack, and the two currently live together in Brighton, UK.He created his account on February 24th, 2007, but he started uploading videos from November 12th, 2012.He is known for his energy, distinct accent, loud commentary and yet sometimes gentle nature and signature green hair (which he dyed for charity alongside Markiplier).When he was still in school, he got a severe injury to his eye which later became infected, and his friend began calling him "Jack Septic Eye", after figuring out that Seán's mother called him Jack. Jack is the youngest of five, having two brothers and two sisters.His siblings are Allison, Susan, Malcolm, and Simon.