TOKYO • Once asked on Twitter about his receding hairline, Masayoshi Son, founder of Japanese telecoms giant SoftBank, retorted: "My hair is not receding. I'm advancing."
It was a typically bullish remark from the 60-year-old tycoon, listed by Forbes as Japan's richest man with an estimated fortune of US$22.2 billion (S$29.7 billion), who has embarked on a furious spree of purchases culminating in last week's deal to take a hefty stake in ride-sharing app Uber.
Under Mr Son's leadership, SoftBank is sending shock waves through the tech world with its massive Vision Fund - a venture capital fund with US$100 billion in its coffers intended for start-ups.
The new fund is expected to dominate the industry to such an extent, it's playfully referred to as a "gorilla".
The bold and flamboyant Mr Son was one of the first personalities from the business world to meet another unconventional tycoon - Mr Donald Trump - last year after his election victory. He pledged to invest US$50 billion in the United States economy and create 50,000 jobs and Mr Trump's off-the-cuff announcement of this gave reporters a first glimpse into the president-elect's unusual communication strategy.
Mr Son's SoftBank has not been afraid to venture outside its core business - completing deals with the likes of e-commerce Chinese giant Alibaba and French robotics firm Aldebaran, which developed the human-shaped "Pepper" robot.
Last Thursday, Softbank and Uber announced that the tech titan would take a large stake in the US ridesharing giant - 15 per cent of the equity, according to a source familiar with the terms of the deal.
But the wheeler-dealing of today belies a background that could scarcely be more humble.
Mr Son was born in 1957 to ethnic Korean parents on the southern Japanese island of Kyushu.
His family scratched a living raising poultry and hogs in a country where Koreans have long faced discrimination stemming from the Japanese occupation of the peninsula between 1910 and 1945.
"I sat in a cart when I was small. It was so slimy that I felt sick. My grandmother, who is dead now, was pulling the cart," Mr Son recalled in a 1996 speech when accepting a business award. "We collected leftover food from neighbours and fed it to cattle. It was slimy. We worked hard," he said. "And I've worked hard."
Mr Son went to the US as a 16-year-old and later studied at the University of California at Berkeley where he began his business career. His first big success came when he invented a computer system to translate English into Japanese. He sold it to Sharp for US$1 million.
In 1981, a year after returning from the US, he founded SoftBank as a software wholesaler and publisher of computer magazines.
Since going public in 1994, SoftBank has consistently made headlines with its aggressive strategy of taking over Japanese and foreign businesses, a jolt to the staid world of corporate Japan.
The company was once the top shareholder in Yahoo and it has been credited with pushing broadband Internet access in Japan.
In the 1990s and 2000s, SoftBank bought and sold Ziff-Davis Communications, the US publisher of computer magazines including PC Magazine, as well as chipmaker Kingston Technologies, and conference organisers Interface and Comdex.
It also owns the Fukuoka-based Hawks baseball team.
The company shook up a market long dominated by NTT DoCoMo and smaller rival KDDI, introducing a significantly cheaper fee schedule and bringing Apple's iPhone to Japan.
Although it no longer has the monopoly on the wildly successful iPhone, SoftBank Mobile is Japan's third-largest carrier, and does particularly well among urbanites, at whom its savvy marketing campaigns are often aimed.
"He's an unusual character," Mr David Gibson, an analyst at Macquarie Bank, said of Mr Son. "He has a more longer-term vision than many other investors," he told AFP.
Mr Son also expanded into the solar power sector as Japan searches for safe and clean alternatives to nuclear power in the wake of the Fukushima atomic crisis.
The tycoon became a massively followed presence on Twitter at the time of the nuclear crisis, using the social media platform to rail against nuclear energy.