Ai Weiwei (born 18 May 1957) is a Chinese artist and activist, who is also active in architecture, curating, photography, film, and social and cultural criticism. Ai collaborated with Swiss architects Herzog & de Meuron as the artistic consultant on the Beijing National Stadium for the 2008 Olympics. In addition to his art work he has investigated government corruption and cover-ups, especially the alleged corruption scandal during the construction of the Sichuan schools that collapsed in the 2008 Sichuan earthquake. He uses the internet to communicate with people all over China, especially the young. On 3 April 2011 police detained him at Beijing airport and still have not filed any official charges. His studio in the capital was sealed off, and his staff interrogated pursuant to allegations of “economic crimes”. On 20 April Ai was appointed Visiting Professor of the Berlin University of the Arts.