1989: Boris Berezovsky leaves his career as a mathematician following the collapse of the Soviet Union and establishes the Logovaz car dealership which allows him to sell off Russian made vehicles at profit. The company makes him a multimillionaire.
1995-1997: Berezovsky establishes himself as one Russia's leading oligarchs and acquires a stake in Russian television channel ORT Television, airline Aeroflot and the lucrative Sibneft oil company with Roman Abramovich. He is credited for securing president Boris Yeltsin's 1996 re-election by forging an alliance with several other prominent businessman to fund his campaign.
1999: The businessman reaches his height of power and political influence by being appointed the deputy secretary of Russia's security council and securing a place among the Yeltsin inner circle known as the "family". He backs Vladimir Putin to succeed Yeltsin as president and uses his TV company to conduct a smear campaign against his main rivals during the run up to the 2000 election.
2000: Berezovsky's relationship with the new president begins to disintegrate after Putin vows to crack down on oligarchs and limit their political power. The businessman leaves Russia for self-imposed exile in the UK where he launches a campaign to overthrow Putin.
2001: The Russian government demands Berezovsky's extradition on fraud and money laundering charges but Britain refuses. He is granted political asylum two years later.
2006: Alexander Litvinenko, a former Russian spy who worked for Berezovsky, is assassinated after being poisoned with Polonium-210 in a London hotel. Berezovsky accuses Putin of being behind the death.
2012: Berezovsky loses a $6.5 billion legal battle against Chelsea football club owner Roman Abramovich who he claimed blackmailed him into selling shares in Sibneft at a reduced price. The judge describes Berezovsky as an "inherently unreliable witness", who is "deliberately dishonest". His legal bill is estimated at £100m.
January 2013: He is reported to be in financial difficulties during legal proceedings brought by his former partner Elena Gorbunova who won a freezing order on his assets amid claims he owes her money.
March 2013: Berezovsky is found dead at his home in Ascot, Berkshire, at the age of 67.
