Dr Kádár has been conducting historical research and has been participating in digital humanities projects for 15 years. His former and current clients include:


-United States Holocaust Memorial Museum (Washington, DC, US)

-Yad Vashem Archives (Jerusalem, Israel)

-The Rothschild Foundation (Hanadiv) Europe (London, UK)

-Commission for Art Recovery (New York, US)

-Hungarian Jewish Archives (Budapest, Hungary)

-Budapest Holocaust Museum and Education Center (Budapest, Hungary)