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

Movie producer Joe Simon-Whelan sues, believing his work is genuine

The Andy Warhol Foundation for the Visual Arts has awarded the museum $600,000

A source close to the Andy Warhol Authentication Board hints at a change of heart

Allegations circulate that curator Pontus Hultén created unauthorised replicas

Charges focus on former executive director of the New York Academy of Art

Each of the twelve motorists have been assigned a vehicle restored by Christie, their route incorporating a series of art fairs

The work is one of the “Death and Disaster” series which rarely come on the market

The deal could be worth around $1 billion

This is the first time a complete set of the series is on offer

Denying the artist’s homosexuality makes his work more saleable, she says

Esther Robinson’s engrossing movie includes footage of several of Williams’ films

How the money men have changed the market

Financial buyers have had a dramatic impact on the way the art market works

Alan Yentob shines a revealing light on the secretive world of the Warhol Authentication Board

The Warhol Foundation adds curatorial experts to attempt to ease the controversy surrounding its authentication board

Ms Lindholm has been attempting to regain Warhol's Red Elvis since 2000

The decision ends a dispute that started in 2000

The Alcoa Corporation is marking its entry into Russia by funding the tour of a Warhol Museum show

The gift increases the museum’s endowment to $7.1 million

The panel has agreed to reveal, on a case-by-case basis, why it rejects works, but the process is still far from transparent

Corbis already represents the archives of Christie’s, Reuters, Condé Nast, and the Ansel Adams Trust

The board acknowledges that the artist “employed assistants”, but says that he “carefully supervised them”

The panel has attracted controversy for refusing to authenticate works attributed by their owners to Warhol

Ada Berkowitz, New York

Jablonka is running concurrent shows on two giants of the 20th century

Jablonka, Cologne

Four people are responsible for establishing whether works by the artist are authentic. Their decision is final. Now they are under attack by collectors who say they have ulterior motives for rejecting works

5-minute portraits exploring the cult of celebrity

These never-before-seen works show a more personal side of the artist