Protopopescu was the director of the National Theater in Chernivtsi (1926-1927), and also a press attaché at the Romanian Legation in London (1928-1930).
Protopopescu was arrested and imprisoned in spring 1938 during the crackdown on the Iron Guard by KingCarol II's dictatorship. In 1948 he was arrested again by the communist authorities. He tried to commit suicide by cutting his veins. He was sent to a hospital and then arrested again. He made a new and successful attempt at suicide: leaning over an elevator shaft, he was decapitated by the cabin.