German artist’s first major US retrospective presents career of constant reinvention

The ruling in long-standing legal battle may threaten defence that a purchase was made in good faith

After 80 years, works by the Mexican artist known for his volatile relationship with Frida Kahlo are again on view

The show will be the first North American retrospective of the artist

The fate of the proposed building is up in the air

Concerns over Jean Nouvel skyscraper, to house museum extension in its base

Gallery hopes to buck the downturn with transatlantic expansion

Twenty Factory regulars look back on the creative freedom that fuelled the New York enterprise, while three art schools are brought under the microscope

“We meet a broader range of collectors here”

The difficulty has arisen because Mr Eastman left the bulk of his estate in a “marital trust” for his wife

The New York organisation has disbursed more than $200m in cash grants and art donations since the artist's death in 1987

The new deal will earn them approximately $65m

William Lieberman’s eclectic holdings yielded bargains

Following its disappearance in 2003 and an international sting, the Sumerian statue was retrieved

Shortly before his death in January, William Rubin handed us his manuscript

Artists, actresses and property developers compete for the best properties in the area

The plum blossoms painting is one of the artist's last works

The agents who had investigated stolen art will now work on cases related to terrorism and fraud

Works from the Museum of Modern Art’s fabled collection continue their world tours for another year

John Elderfield and Kynaston McShine exchange positions

The Museum of Modern Art has relocated to a working-class borough across the river while its famous headquarters expands

The area is home to a growing number of cultural institutions

As the Japan Society presents a retrospective of Yoko Ono’s work, she talks about the avant-garde in the 60s and her latest work

Over 125 artists signed an open letter to the museum detailing the group’s regret over the museum’s refusal to negotiate with the union

The museum has spent over $250,000 contesting the attempted subpoena of two paintings

"Saved From Europe" commemorates the man who brought art condemned by the Nazis to the US and worked for the restitution of looted art

Clement Greenberg said he was “the greatest painter” alive; then in the 70s the world stopped talking about Jules Olitski

And a group of exhibitions, about Duchamp, Balthus and Basquiat, coincides with new art book releases this autumn

The major show chronicles the many faces of Warhol's fascination with fame