After World War II he quickly made a career for himself as a lawyer and politician as well as a prolific writer. He worked as an attorney in Amsterdam from 1940 to 1950, and between 1946 and 1950 he was active within the editorial board of the Dutch journal for the legal profession, Nederlands Juristenblad. In 1946, he was elected to the Dutch Senate for the Dutch Labour Party (PvdA); his term lasted from 1946 to 1950 and later he had a second term, from 1963 to 1977. In the same period (1946–1950), he was a member for the Dutch Labour Party of the Provincial States of North Holland and served on the town council of Heemstede.