Mustafa İsmet İnönü was a Turkish general and statesman, who served as the second President of Turkey from 11 November 1938 to 22 May 1950, and its Prime Minister three times: from 1923 to 1924, 1925 to 1937, and 1961 to 1965.
İnönü is acknowledged by many as Mustafa Kemal Atatürk's right-hand man, with their friendship going back to the Gallipoli campaign. In the Greco-Turkish War of 1919–1922, he served as the first Chief of the General Staff from 1922 to 1924 for the regular Turkish army, during which he commanded the forces of the battles of First and Second İnönü. Mustafa Kemal bestowed İsmet with the surname İnönü, where the battles took place, when the 1934 Surname Law was adopted. He was also chief negotiator in the Mudanya and Lausanne conferences for the Ankara government, successfully negotiating away the Sevre treaty for the Treaty of Lausanne. As his Prime minister from 1923 to 1924 and 1925 to 1937 İnönü executed many of Atatürk's modernizing and nationalist reforms.
İnönü succeeded Atatürk as president of Turkey after his death in 1938, and was granted the official title of Millî Şef by the parliament.