ELON Musk is the eccentric billionaire behind some of the world's most innovative companies including SpaceX and Tesla.
He hit the headlines in 2020 by naming his newborn baby X Æ A-12 before launching USA's first manned spacecraft into orbit since 2011.
What is Elon Musk's net worth?
Self-made billionaire Elon Musk became the richest person on the planet in January with an estimated personal fortune of $185bn (£136bn).
A notorious workaholic, he doesn't spend his money on lavish vacations or expensive hobbies.
Instead, the entrepreneur spends most of his free time at the office or in factories.
At the end of the day he heads back to one of several Los Angeles mansions he owns.
Now, Musk has made the price of Bitcoin break all-time records after he revealed Tesla invested $1.5billion in the cryptocurrency.
It soared beyond $48,000 today (February 9) on the cyptocurrency markets as investors raced to take advantage of an inevitable post-Musk surge.
In a statement, Tesla revealed it would soon begin accepting payments in Bitcoin, and Musk admitted the firm had made a massive investment of its own in the surging online currency.
Meanwhile another tweet from Musk sent another crytocurrency soaring after he described the once-mocked Dogecoin currency as "the future".
The coin, which began as a joke in 2013, has surged in value by 1,250% over the past year after a huge number of investors decided to simultaneously pump cash into the coin to make it a legit trading option.
How did he make his fortune?
In 1995 he and his brother Kimbal started software firm Zip2, which created internet city guides for the New York Times and Chicago Tribune.
Four years later, in February 1999, Compaq acquired the first for $307million in cash.
Musk pocketed $22million for his seven per cent share from the sale.
Later in 1999 he co-founded X.com, one of the world's first online banks, which merged with PayPal the following year.
Musk was ousted from his role as CEO in October 2000 due to disagreements with other company executives over his wish to move PayPal's Unix-based infrastructure to Microsoft one.
In 2002, PayPal was acquired by eBay for $1.5billion in stock.
Musk, who held 11.7 per cent of PayPal shares, scored a huge payday from the move, receiving $165million.
He went on to found SpaceX and took over Tesla Motors, which is now worth around $70bn.
What companies does Elon Musk own?
Elon Musk began investing in space travel in 2001 when he tried to buy Russian ballistic missiles that he hoped could send payloads into space.
Instead he set about building his own rockets through his firm SpaceX.
The company has pioneered re-usable rockets and has successfully landed its Falcon 9 craft, a first for an orbital rocket.
SpaceX has won contracts to launch payloads into orbit for Nasa and is now valued at more than $20bn.
Musk has much grander plans including a colony of a million people living under glass domes on Mars.
In May 2020, SpaceX launched its first manned flight, the Demo-2, becoming the first private company to place a person into orbit and dock a crewed space-craft with the ISS.
In 2004, Musk was involved in refinancing start-up tech firm Tesla Motors and oversaw the design of its the Roadster electric car.
He took over as boss in 2008 and has led the push to make electric cars mainstream.
In 2018, Musk was forced to resign as Tesla chairman and pay a $20million fine after settling a deal with US regulators over tweets about taking the company private.
The US Securities and Exchange Commission said his claims were "false and misleading".
The company's market cap hit $100bn in January 2020, helping Musk's personal net worth soar.
Musk funded the SolarCity firm founded by his cousins in 2006, which makes solar panels.
By 2013, SolarCity was the second largest provider of solar power systems in the US.
Tesla acquired SolarCity for more than $2billion in 2016 and converted it into its solar division.
But the announcement of the deal resulted in a more than 10 per cent drop in Tesla's stock price.
He also co-founded Hyperloop One, which aims to develop high-speed train travel, and The Boring Company which is testing cheaper ways to dig tunnels.
Another of Musk's start-up is Neuralink, which aims to integrate the human brain with artificial intelligence through implants in the skull.
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