Fujitsu, the company that built the flawed Horizon IT system, has fired its top boss in the midst of the scandal.
Rod Vaudry, 67, was fired as Fujitsu's global president in 2014 over personal conduct issues, former colleagues said.
He returned to his native Australia and is now accused of making millions of dollars by participating in a stock market “train wreck” floating stock scandal.
Mr Vaudry told the BBC he was not involved in the Horizon project.
Mr Vaudry was responsible for the company's UK operations from 2011 to 2014, during a critical period of the Horizon scandal.
But if the Horizon issue had been discussed in the UK Council, Mr Beaudry would have been aware of it. He was the executive chairman of British company Fujitsu Services and was a member of the company's audit and corporate governance committees, according to House of Commons filings.
At this point, details began to emerge publicly, with members of Congress and journalists voicing concerns. But until 2013, the Postal Service was prosecuting dozens of people each year based on evidence from faulty branch computer systems.
Alarm bells were ringing even within the company. In 2013, lawyers warned the Postal Service that Fujitsu employees had given incomplete testimony in court and had not disclosed information about the bug in their witness statements.
This was an important turning point in the story, but neither Fujitsu nor the Post Office came clean about Horizon's problems until years later, inflicting further suffering on hundreds of people who were wrongly convicted.
Mr. Vaudry was the only Westerner on Fujitsu's main board and was responsible for the company's operations outside Japan, including the key market of the United Kingdom.
Two of Mr Vaudry's well-known former colleagues told the BBC that he was “dismissed for cause” from the company in early 2014. Sources claim this was a matter of personal conduct and had nothing to do with Horizon. Expenses. As one person puts it, we are “living for our lives.”
One person described his management style as “boisterous” and at times yelled at co-workers. Depending on which side you're on, you're either a “bulldog” or a “bully.” Other sources agreed.
His tenure was relatively short, just over two years, and there is no record of any severance payments to Mr Vaudry in Fujitsu's UK accounts, unlike the millions of pounds paid to outgoing bosses before and after his retirement. .
Mr Vaudry is not currently scheduled to appear before the Horizon inquiry, but will hear from Duncan Tait, the UK chief executive who reported to him. Foreigners can also give evidence, but investigators have no power to compel them unless they return to the UK.
After Fujitsu, Mr Vaudry returned to Australia, became embroiled in another public scandal and became a millionaire.
