Ann Freedman, former president of the disgraced gallery Knoedler & Co., filed a defamation suit on Wednesday, September 11 in New York State Supreme Court. Freedman helmed the historic gallery until it closed in 2011 amidst charges that it had sold forged artworks worth nearly $80 million.

In her case, Freedman declared that she did due diligence in researching a collection that was presented to her and listed nearly 20 experts, including curators from the Museum of Modern Art, the National Gallery of Art and the Solomon R. Guggenheim Museum, that told her that the works were authentic. However, in many of these cases, the comments were unofficial and decidedly vague.

Freedman’s case is aimed at Manhattan art dealer Marco Grassi who was quoted in a New York magazine as saying “A gallery person has an absolute responsibility to do due diligence, and I don’t think she did it. The story of the paintings is so totally kooky. I mean, really. It was a great story and she just said, ‘this is great.’”

Long Island-based art dealer Glafira Rosales and her boyfriend are allegedly responsible for selling the 60 forgeries to Knoedler & Co. The couple claimed that the works were authentic masterpieces by artists such as Jackson Pollock, Willem de Kooning and Mark Rothko. It was recently discovered that they were painted by an artist in his home studio in Queens.