In 1944,[3] Pos joined the Netherlands Indies Civil Administration, and prosecuted "minor war crimes" for the International Military Tribunal for the Far East in Japan.

Pos was back in the Netherlands in 1948,[4] however he decided to return to his native country of Suriname in 1950 where he was appointed as judge and attorney general.

Harold Riedewald, and Eddy Hoost were not just former students of Pos during the time he was teaching at the Law School in Suriname, but also personal friends.

[5] The play is about a fictitious meeting between the Surinamese reporter Jozef Slagveer and his Dutch counterpart Han de Graaf, in which the events after the independence of Suriname are discussed.

This cosmopolitanism can also be found in the collection of essays and travel reports that appeared on the occasion of his 74th birthday, Reizen en stilstaan ("Travel and residence") (1988), in which he also reflects on the moral implications of the judgments he had to express as a representative of the colonial authority over colonized people.