After a short time in Paris as a refugee, Kaldor moved to Australia in 1949 with his parents and younger brother Andrew.

[2] Kaldor has undertaken thirty two contemporary art projects, working with international artists including Christo and Jeanne-Claude, Gilbert and George, Sol LeWitt, Richard Long, Jeff Koons, Charlotte Moorman with Nam June Paik, and Marina Abramović.

In 1990, Kaldor brought Christo to Australia for a twenty-year retrospective at the Art Gallery of New South Wales.

In 2008, Kaldor gifted his collection of more than 260 works to the Art Gallery of New South Wales, including works by Robert Rauschenberg, Richard Long, Christo and Jeanne-Claude, Sol LeWitt, Jeff Koons, Ugo Rondinone, and Bill Viola.

[1] At the time, the collection was valued at A$35 million, and it is the most significant donation made to the Gallery.