[1] He married Anna Margareta von Friesen Parelius (1892–1970) on 11 October 1919, but divorced with her in 1939.
On 5 April the same year, Platou married Anette Beate Wackenitz Horn (1908–94).
[1] Platou was born in Hamar, but studied at Otto Treider's private school in Kristiania from 1914 to 1915.
In 1963, a research department was established, which some years later was separated into a subsidiary with the name A/S Shipping Consultants.
[1] Platou was decorated as a Commander of the Royal Norwegian Order of St. Olav in 1975.