As President, Putin launched a campaign against corrupt oligarchs and economic mismanagement. He appointed Medvedev Chairman of gas company Gazprom's board of directors in 2000 with Alexei Miller. Medvedev put an end to the large-scale tax evasion and asset stripping by the previous corrupt management. Medvedev then served as deputy chair from 2001 to 2002, becoming chair for the second time in June 2002, a position which he held until his ascension to Presidency in 2008. During Medvedev's tenure, Gazprom's debts were restructured and the company's market capitalisation grew from $7.8 billion in 2000 to $300 billion in early 2008.