He worked with international law, and is known for his time as leader of the Norwegian legation in Stockholm from 1921 to October 1940, a period which includes the early phase of World War II.

He was born in Lier as the son of Colonel Sigvard Polidor Wollebæk (1835–1920) and his wife Anine Julie Augusta Dahl (1834–1912).

[1] Following 9 April 1940, when Norway was invaded and subsequently occupied by Nazi Germany, Stockholm became an important city for Norwegian politics.

Wollebæk had refused to obey the orders of Vidkun Quisling—who during the German invasion declared a Fascist coup d'état—and the Norwegian legation in Stockholm was soon reinforced with additional personnel.

Jens Bull, the highest-ranking civil servant in the Ministry of Foreign Affairs, was sent to Stockholm, and the Norwegian government-in-exile, once secure in London, sent its representatives.