He served in several ministerial posts, and was Minister for Foreign Affairs and Deputy Prime Minister in the 1974 national unity government following the restoration of democracy.
He taught law at the University of Athens from 1937 to 1942, and became a politician following the liberation of Greece from the Axis Occupation, being elected to the Hellenic Parliament from 1946 on.
In 1994 he was awarded the title of Righteous Among the Nations by Yad Vashem.
[1] He held cabinet posts as Justice Minister (1945), Minister for National Education (1946), Commerce and Industry (1949), Finance (1951), National Defence (1952) and Government Coordination (1963–1965).
Increasingly sidelined by Karamanlis' New Democracy, Mavros joined the Panhellenic Socialist Movement and was elected an MP with it in 1981, and an MEP in 1984.