Whose sculpture "Balloon Dog" sold for $58.4 million dollars?

At Christie’s auction the "Balloon Dog" (Orange) by Jeff Koons — an American artist known for brightly colored reflective sculptures that resemble balloons — was sold to an anonymous telephone bidder for $58.4 million, surpassing initial $55 million estimates “the most expensive work by a living artist sold at auction,” according to the New York Times.

Jeffrey Koons (born January 21, 1955) is an American artist known for working with popular culture subjects and his reproductions of banal objects—such as balloon animals produced in stainless steel with mirror-finish surfaces. He lives and works in both New York City and his hometown of York, Pennsylvania.

Koons studied painting at the School of the Art Institute of Chicago and the Maryland Institute College of Art in Baltimore. While a visiting student at the Art Institute, Koons met the artist Ed Paschke, who became a major influence and for whom he worked as a studio assistant in the late 1970s. He lived in Lakeview, and then in the Pilsen neighborhood at Halsted Street and 19th Street.

Koons was born in York, Pennsylvania, to Henry and Gloria Koons. His father was a furniture dealer and interior decorator; his mother was a seamstress. When he was nine years old, his father would place old-master paintings copied and signed by his son in the window of his shop in an attempt to attract visitors.As a teenager he revered Salvador Dalí so much that he visited him at the St. Regis Hotel in New York City.