He is the lead vocalist and guitarist, along with Nanna Bryndís Hilmarsdóttir, of the Icelandic indie folk band Of Monsters and Men.

[1] Ragnar attended Fjölbrautaskólinn í Garðabæ, a school in Garðabær.

[3] The band then entered the 2010 annual Icelandic music competition Músíktilraunir, which they won.

The album charted in multiple regions and the band gained popularity worldwide.

[5] After the Seattle radio station KEXP broadcast a performance from Ragnar's living room, the band went viral.