Lasson was born in Christiania to jurist and politician Peder Carl Lasson (1798-1873) and Ottilia Pauline Christine von Munthe af Morgenstierne (1804-1886).

[1] In 1857 he married his cousin Alexandra Cathrine Henriette von Munthe af Morgenstierne (1838-1881).

They had eleven children; among them were composer Per Lasson,[2] painter Oda Krohg[3] and singer Bokken Lasson.

[4] Lasson was barrister with access to work with the Supreme Court from 1861.

This Norwegian law-related biographical article is a stub.