Ninković, was a cavalry officer in the Royal Yugoslav Army and a prominent lawyer educated in France and Kingdom of Yugoslavia, who was imprisoned and persecuted after the communist government was established in Yugoslavia in 1944 and his mother, Višnja (née Popović), also studied law at the University of Belgrade.

[7] After leaving office he remained involved as a legal expert within government working groups preparing draft legislation as the deputy chairman of the working group preparing the draft law on restitution of confiscated church property (adopted by Parliament in 2006).

[citation needed] In 2009 he actively campaigned for the immediate adoption of a just Law of restitution of nationalised and confiscated property, which is a condition of Serbia's potential membership of the EU.

His campaign included a direct action occupation of hotel Astoria which had been built by his grandfather, Djurdje S. Ninković, and owned by his family until forceful nationalisation by the Communist regime in 1948.

[8] He has been very critical of The Law of Restitution of Property and Compensation, which was enacted by the Government of Serbia in October 2011 and implemented from March 2012.

It also imposes an absolute cap of EUR 2 billion for the total amount of compensation which can be paid to those owners whose property will not be returned.