Christo and Jeanne-Claude began their collaboration in 1961, and have lived in New York City since 1964. Jeanne-Claude died in 2009. Their large-scale projects include Wrapped Coast, Australia, 1968-69; Valley Curtain, Rifle, Colorado, 1970-72; Running Fence, Sonoma and Marin Counties, California, 1972-76; Surrounded Islands, Biscayne Bay, Florida, 1980-83; The Pont Neuf Wrapped, Paris, 1975-85; The Umbrellas, Japan-USA, 1984-91; Wrapped Reichstag, Berlin, 1971-95; Wrapped Trees, Riehen, Switzerland, 1997-98; The Gates, Central Park, New York City, 1979-2005; and The Floating Piers, Lake Iseo, Italy, 2014-16. Wolfgang Volz has worked with Christo and Jeanne-Claude as the exclusive photographer of their works since 1971. He was also project director (with Roland Specker) for Wrapped Reichstag and (with Josy Kraft) for Wrapped Trees, and was in charge of The Wall - 13,000 Oil Barrels, Gasometer Oberhausen, Germany, 1998-99 and Big Air Package, Gasometer Oberhausen, Germany, 2010-13. His close collaboration has resulted in many books and more than 300 exhibitions in museums and galleries around the world.