Who am I? I earned three Oscars in my 294 film career, thereby earning more Academy Awards than any other Australian in the 20th century.

Orry-Kelly won 3 Academy Awards for Best Costume Design. The three films were "An American in Paris" (1951), "Les Girls" (1957), and "Some Like It Hot" in 1959. In Orry-Kelly's three-decade career he worked on almost 300 films!

https://en.wikipedia.org/wiki/List_of_Australian_Academy_Award_winners_and_nominees
https://en.wikipedia.org/wiki/Orry-Kelly

In 2013, Catherine Martin took the lead as the most decorated Australian with 4 Academy Awards. Two for "Moulin Rouge!" (2002) and two for "The Great Gatsby" (2013).

https://en.wikipedia.org/wiki/Catherine_Martin_(designer)