Indiana-based Valparaiso University is reportedly hoping to raise $20m with the sale of works by O’Keeffe, Childe Hassam and Frederic Church from its museum’s collection

Last year, the late Microsoft co-founder’s art collection brought in a record $1.6bn over two auctions

Museum associations and the university’s former art department chair have spoken out against the planned deaccessioning

All you ever wanted to know about O’Keeffe, including a comprehensive biography, the artist’s “perfect” novice recipe book, and her letters to photographer Alfred Stieglitz—selected by the curator Theodora Vischer

Our pick of highlights from this week's auctions and fairs

A show opening at the Clark Art Institute reveals how Georgia O’Keeffe thwarted her sister’s career in art

Christie's American art sales this week realise a new record for Hartley but Sotheby's struggles to get the pricing right on Hopper's Shakespeare scene

Bumps caused by chemical reactions can now be mapped by waving a hand-held device that one professor likens to a Star Trek “tricorder”

A monumental painting of the American West by Emanuel Leutze breaks records while works by Rockwell and Hopper flop

With only two lots unsold, the auction house nets $362.6m in evening of avid bidding

Modernist works from the Georgia O’Keeffe Museum will be offered in New York in November