A striker, Jack began his career with Ross County, where he played in the Highland Football League at the age of 14.
In October 1987, Dunfermline Athletic's manager Jim Leishman paid £15,000 to secure Jack's services and he made an instant impression, scoring on his debut in a 3–2 away defeat to Motherwell.
His spell would last only six months and in October 1993 he moved on to Ayr United before retiring from the professional game at the end of the 1993–1994 season.
On his appointment, Jack was quoted as saying "this new role is one where I hope we can make a difference to the future prospects of Scottish football.
[15] On 23 April 2014, Jack was appointed manager of Turriff United a Scottish Highland Football League club from Aberdeenshire.
[16] After 4 years in that position Jack left the team after helping them reach 2nd place in the Highland League, their highest ranking ever.