 As an employee at the Royal Danish Naval Building Service and from 1935 Head of the Naval Architecture section, he designed a number of Navy buildings in a unique style.Jens Klok designed the Marine Air Station in Avnsø in 1937 and in Holmen, Copenhagen in 1939.He later designed the Royal Danish Naval Academy office building in 1940, with Holger Sorensen, and 
had a special exhibition of his works at Charlottenborg Spring Exhibition between 1942-1943.