Rosenberg, who has been an expert witness in court cases including the Knoedler trial, retrained as an appraiser when he retired as an art dealer in 1985

The NBCUniversal vice chairman and co-founder of Creative Artists Agency claims two art dealers duped him into buying the fake painting for nearly $1m in 2001

He was the National Gallery of Art’s founding curator of 20th-century art and led the Modern Art Museum of Fort Worth and Memphis Brooks Museum of Art

The Hilti Trust and the defunct gallery’s owners are in the process of reaching an agreement—but they could still end up in court

The ruling was based on the loose business dealings of Hammer, the gallery and its parent company—like reimbursing him $2m for luxury cars

Three productions are due to examine the Knoedler forgery scandal

Ten cases were brought to court by collectors who purchased fakes through the gallery

The case against Oliver Wick was brought by the casino billionaire Frank Fertitta

Players in the trade acknowledge the problem, but disagreement over how to address it has resulted in a gridlock that helps to keep forgeries in circulation

The Long Island dealer says she was abused and coerced into committing fraud by partner who fled to Spain

Judge's findings reveal what to look out for in art transactions

Collectors still in the dark even when experts have doubts as reports rarely published

In an exclusive interview, Ann Freedman explains her version of events in the ongoing forgery case that engulfed the gallery

Re: Former director of scandal-beset Knoedler Gallery breaks her silence, The Art Newspaper, April 2016

Abstract Expressionism experts forced to watch what they write and say

Testimonies reveal how much the New York gallery depended on sales, and huge mark-ups, of works from Glafira Rosales

Agreement came before owner and former director could testify, but the trial gripped the New York art world

Mid-trial deal comes just a day before the former gallery director was scheduled to take the stand

James Martin of Orion Analytical says the gallery asked him to remove key findings, like a pigment that was not in use at the time of painting

Seven of 11 specialists named by the gallery say they never authenticated work that turned out to be a forgery

David Anfam and Christopher Rothko were among 11 experts the gallery listed as having viewed the painting

Eleanore De Sole said she went into a “shaking frenzy” when she read that another work sold by Knoedler was suspected to be fake

Domenico De Sole bought a fake Rothko from the gallery in 2004

Lawyers for the collectors and the gallery go head-to-head as one of New York’s biggest art world scandals goes to trial

It should provide guidance on who is responsible when forgeries are sold

Both sides seek to exclude key witnesses and evidence from the forgery case which is set to begin on 25 January

Glafira Rosales’s name was not mentioned in connection with the auctions, which included pieces by Sean Scully, Kenneth Noland, Jules Olitski, Louise Lawler, Andy Warhol and Ad Reinhardt

Collector John Howard bought the forgery from now defunct gallery for $4m

Judge dismisses attempts to throw out lawsuits and orders trial over fake Abstract Expressionists

The gallery’s former director Ann Freedman will “tell her story”, her lawyer says