Italian-Australians have been a presence in Australia since its earliest days as a British colony, but the largest influx of Italian immigrants occurred after World War II. As the children and grandchildren of this generation came of age, they were far more confident about taking advantage of what Australia has to offer than the descendants of previous generations.
Italian names are now prominent in every field, and the earlier tendency to declare "I'm an Australian!" when asked about one's heritage has been replaced by a pride in one's family and where they came from.
From Wikipedia, here is a list of Italian-Australians who have made a name for themselves in a variety of occupations: