Known by his schoolboy nickname "Twiggy," Forrest was a onetime stockbroker and keen amateur boxer.
He once tried to make a living as an alpaca farmer and is a descendant of the first premier of the state of West Australia, Lord Forrest of Bunbury.
Australia's biggest philanthropists, in 2023 he and wife Nicolai gifted shares worth nearly A$5 billion to their foundation.
Andrew Forrest founded Fortescue Metals Group in 2003. It's an iron ore giant which is now transforming itself into a green energy powerhouse.
Forrest chairs his Minderoo Foundation, a philanthropic outfit with an A$9.6 billion endowment, focussed on everything from gender equality to climate change to rebuilding Ukraine.
In 2022, his privately held Squadron Energy paid an estimated A$4 billion for Australia's biggest wind energy company, CWP Renewables.
Forrest has also promised to spend A$750 million on rebuilding Ukraine's energy and communications infrastructure.
Forrest and his wife Nicola announced their separation in July 2023 after being married for more than three decades.