He held various posts, including ambassador of Turkey to West Germany and minister of finance.

[1] In 1962 he was appointed undersecretary of the State Planning Organization which he held until 1964 when he was named as the ambassador of Turkey to West Germany.

[1][2] Following the military intervention of Turkey in Cyprus Müezzinoğlu was named as the head of the Coordination Council in August 1974.

[3] He was elected to the Turkish Senate for the Republican People's Party in 1975 from his hometown, Kayseri.

[4] Müezzinoğlu was again appointed minister of finance on 5 January 1978[6] and served in the cabinet headed by Ecevit until 1979.