He is best known as the lead guitarist of the Icelandic indie folk band Of Monsters and Men.
Brynjar has been in a relationship with musician Ragnhildur Gunnarsdóttir, who's also a touring member of OMAM, since at least 2014.
Brynjar joined Nanna Bryndís Hilmarsdóttir's solo project, Songbird in 2009.
[3] The project soon expanded with Ragnar Þórhallsson and Arnar Rósenkranz Hilmarsson joining.
The band then entered the 2010 annual Icelandic music competition Músíktilraunir, which they won.