Ai Weiwei (Chinese: 艾未未; pinyin: Ài Wèiwèi, English pronunciation (help·info); born 28 August 1957 in Beijing) is a Chinese contemporary artist and activist. His father's (Ai Qing) original surname was written Jiang (蔣).[1][2][3] Ai collaborated with architects Herzog & de Meuron as consultant on the Beijing National Stadium for the 2008 Summer Olympics.[4] As an activist, he has been openly critical of the Chinese Government's stance on democracy and human rights. He investigated government corruption and cover-ups, in particular the Sichuan schools corruption scandal following the collapse of "tofu-dreg schools" in the 2008 Sichuan earthquake.[5] In 2011, following his arrest at Beijing Capital International Airport on 3 April, he was held for 81 days without charge; officials alluded to allegations of "economic crimes".[6]