Sir Ponnambala Thiaga Rajan was born in Uthamapalayam and educated at The Leys School, Cambridge and Jesus College, Oxford. He graduated in history and law and practised as an advocate for some time before joining the Justice Party. He was the Chief Minister of Madras Presidency from April 4, 1936, to August 24, 1936. He was also the last President of the Justice Party.
Rajan was elected to the Madras Legislative Council as a Justice Party candidate in 1920 and served as a legislator till his
defeat in 1937. He held various offices such as the Minister of Public Works and then, the Chief Minister of Madras Presidency. From 1939 to 1944, Rajan supported Periyar but broke off and headed the rebel Justice Party till 1957. Rajan was elected to the Madras Legislative Assembly in 1952 and served as a legislator from 1952 to 1957. Rajan died in 1974 at the age of 82.