He served his first term, as a member of the Home Rule Party (Heimastjórnarflokkurinn), from 4 January 1917 to 7 March 1922.

[1] In June 1926, Jón traveled with King Christian X to Seyðisfjörður aboard the HDMS Niels Juel.

Following the king's departure back to Denmark on 22 June, Jón traveled with HDMS Gejser to Norðfjörður, where he grew up.

On the evening of 23 June, he suddenly collapsed and died while visiting the Jón Guðmundsson, the local priest.

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