Zuma served as Deputy President of South Africa from 1999 to 2005, but was dismissed by President Thabo Mbeki in 2005 after Zuma's financial adviser, Schabir Shaik, was convicted of soliciting a bribe. Zuma was elected President of the African National Congress (ANC) on 18 December 2007 after defeating Mbeki at the ANC conference in Polokwane. On 20 September 2008, Mbeki announced his resignation after being recalled by the ANC's National Executive Committee. The recall came after South African High Court Judge Christopher Nicholson ruled Mbeki had improperly interfered with the operations of the National Prosecuting Authority (NPA), including the prosecution of Jacob Zuma for corruption.