1928–1947:- Advocate at Mysore in the office of the Shri. H.C. Dasappa who was a union Railway Minister in the cabinet of Shri. Pandit Jawaharlal Nehru and Shri. Lal Bahadur Shastri.
1929–1947:- Member of Representative Assembly Mysore. Member of Legislative Council Mysore. Leader of Constitution Assembly Mysore.
1947–1950:- Minister for Home, Mysore Railways, Mysore Army in the cabinet of Shri. K.C. Reddy
1950–1952:- Minister for Home, Transport, Food and civil Supplies.
1948 :- Dr. K. M. Munshi in his autobiography has admired the handling of Hindu Muslim riots by T. Mariappa as minister for Home.
1955 :-The British Guiana Government in its official website has recorded the role of T.M. Mariappa as General Secretary, MPCC in organizing the visit of Mr. Cheddi Jagan, the then Chief Minister of British Guiana Government who had come to India to seek the support of Indian people for ending the British rule in Guiana, South America.
Recognition of Role of T. Mariappa in the State of Mysore and Karnataka