In the world's financial capital, Australian Lex Greensill was every inch the corporate titan. With a company valued in the billions of dollars and a jet setting lifestyle, he mixed with the rich and powerful on a grand scale. Yet many Australians had never heard of Greensill until the company he founded came crashing down sparking one of the biggest international financial scandals since the global financial crisis. On Monday Four Corners investigates the rise and fall of the billionaire from Bundaberg and how his business imploded.