Guðmundur was born in Reykjavík, Iceland, to Jón Bjarnason and Guðbjörg Lilja Maríusdóttir.
[1] Commercially trained in Iceland and the US, Guðmundur worked as a stockbroker on Wall Street until the dot-com bubble burst around the turn of the millennium.
From 2005 to 2008 he attended the Master's program in International Politics at Charles University in Prague.
Guðmundur applied for a place on the list as the Independence Party candidate for the 2016 Icelandic general election, but did not get it.
[7][8][9] The party took part in Iceland's 2021 general election, but failed to get into the Althing with 0.4% of the vote.