1. Originally from Forres, Morayshire, Scotland, Gillan first played for Highland Rugby Club, before attending and playing rugby for Merchiston Castle School in Edinburgh.

1. Originally from Forres, Morayshire, Scotland, Gillan first played for Highland Rugby Club, before attending and playing rugby for Merchiston Castle School in Edinburgh.
In 2013, he moved to Leonardtown, Maryland, where his father was stationed as a member of the Royal Air Force, and Jamie Gillan began playing American football in high school there.
Jamie Gillan then went on to play college football at the University of Arkansas at Pine Bluff, receiving the scholarship offer through a Facebook invitation.
In Week 5, Jamie Gillan punted 7 times for 397 yards including a 71-yard punt that set a career long for Gillan.
Jamie Gillan ended his rookie season with 63 punts for 2,913 yards with 28 punts downed inside the 20 yard line which earned him a spot on the Pro Football Writers Association All-Rookie team.
Jamie Gillan was waived by the Browns on 22 December 2021.
On 24 December 2021, Jamie Gillan was signed to the practice squad of the Buffalo Bills.
Jamie Gillan kicked several field goals in a preseason game against the Bengals following an injury to Graham Gano, and made the 53 man roster.
On 12 December 2022, while playing in a game against the Philadelphia Eagles, Jamie Gillan was flagged for a rare illegal kick penalty.
On 13 March 2023, Jamie Gillan signed a two-year, $4 million contract extension with the Giants.
On 8 March 2025, Jamie Gillan signed a three-year, $10 million contract extension with the Giants.
Jamie Gillan originally went to the United States on a NATO visa through his father.