|President of the Yugoslav Chamber of Commerce|
|5th President of the Executive Council of the People's Republic of Bosnia and Herzegovina|
|Preceded by||Hasan Brkić|
|Succeeded by||Branko Mikulić|
4 November 1918|
Gornji Ribnik, Ključ, State of Slovenes, Croats and Serbs
|Died||22 December 2004
Belgrade, Serbia and Montenegro
|Political party||League of Communists of Yugoslavia|
|Profession||Civil servant, soldier|
|Years of service||1941–1945|
Kolak was born in Gornji Ribnik near Ključ in Bosnia. He studied at the University of Belgrade's Law School until 1940. Kolak joined the Communist Party of Yugoslavia in 1941 thus becoming a Yugoslav Partisan. Later he became a member of the Central Committee of the Communist Party of Yugoslavia.
After the war, Kolak held various posts: he was Secretary of the People's Assembly of Socialist Republic of Bosnia and Herzegovina, President of People's Assembly in Banja Luka, President of the Supervisory Committee, and Minister in the Government of the Socialist Republic of Bosnia and Herzegovina. After that he was spokesman in the Ministry of Finance of the Government of SFR Yugoslavia and spokesman of the President of Yugoslavia, Josip Broz Tito. From 1963 to 1965 he was Vice President of the Executive Council of SR Bosnia and Herzegovina and became President of the Executive Council of SR Bosnia and Herzegovina in 1965 and held that post until 1967. After that he was Vice President of the Federal Government of SFR Yugoslavia from 1967 to 1969 and President of the Yugoslav Chamber of Commerce from 1969 to 1974.