Maurizio Cattelan has exhibited internationally in leading institutions and has participated in the Venice Biennale numerous times. He curated the 4th Berlin Biennale with Massimiliano Gioni and Ali Subotnick. Cattelan also conceived the art magazines Permanent Food and Charley . After the acclaimed 2011 retrospective at the Guggenheim Museum in New York City, he has committed himself to publishing Toiletpaper magazine. Pierpaolo Ferrari is a fashion and advertising photographer and creative researcher. In 2007, he began a collaboration with L'Uomo Vogue . In 2009, he teamed with Maurizio Cattelan to create Toiletpaper .