For his valor displayed at engagements at Topești and Bârsești in the Putna River valley, on 11 August 1917 he was awarded the Order of Michael the Brave, 3rd class.

[1][2] In June 1930, soon after assuming the throne, King Carol II dismissed Bucharest's incumbent prefect of police, naming Marinescu, who held the office until November 1939.

[1] In 1934, Carol considered him to be his "personal guard", and a year later he told Nicolae Lupu that Marinescu was "the only man I trust".

The same year, Marinescu co-authored a hagiographic volume on the king, and delivered a radio address attacking his opponent Iuliu Maniu.

In January 1938, shortly before the National Renaissance Front regime was established, Marinescu returned to his Interior position.