The initiative aims to help doctors improve their observation skills

Richard Dorment, Chief art critic at The Daily Telegraph, discusses the works

An unpublished list provides details of the fate of 44 paintings confiscated by the Andy Warhol estate in 1991

Foundation’s sales agent also worked for authentication board; president rejects claim decisions may have been made for financial gain

The auction attracted 263 bidders, and 1,500 bids from 36 countries

The inaugural sale made $17m last month

The artist’s foundation reveals its intention to become one of the largest grant-making organisations in the country

While some fear the negative effects of the closure of the vetting board, others say its role was not essential

Few will mourn its demise

Joe Simon-Whelan spent three years trying to prove authenticity of a painting depicting the artist himself

Simon-Whelan says he lacks the financial resources to pursue his case

Authentication board says famous museum director “falsified” their history

Gagosian among four called to court

Collector says a signed work from the same series confirms his work is genuine

UK auctioneer says Pietro Psaier worked in The Factory and died in the 2004 tsunami; his body has never been found

Former Factory assistant claims he made the disputed work

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

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

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

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 money is being given to Creative Capital, a nonprofit picking up the slack in arts funding

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

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

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

C&M Arts, Gagosian Gallery, and Paul Kasmin all jump on the bandwagon

The blockbuster show comes to the US via London

The foundation has licensed Warhol imagery for around 13 years

It will comprise of six volumes, beginning with his production from 1961 to 1963

Mr Hayes was told that he was only owed $3.5 million

The Andy Warhol Foundation is appealing the case, which will be heard in October

At 83,000 square feet it is bigger than the Whitney

The judge’s ruling resolves the crux of the legal war between the foundation and the lawyer for Warhol’s estate

Christie's in the dock over whether Warhol's estate is worth $220 million or $558 million

The series known as “Cars” opens the season at the Juan March Foundation