Halldor was born in 1902 in Reykjavik, where he lived until 1905 when his family moved to Laxnes in Mosfellsdalur near the town of Mosfellsbær about 15 km east-northeast of the capital.
Halldor was born in 1902 in Reykjavik, where he lived for the first three years of his life. In 1905 his family moved to Laxnes in Mosfellsdalur near the town of Mosfellsbær about 15 km northeast of the capital.