Sotheby’s will sell the works from collection of Gladstone, who died last year, and more than a dozen pieces from ...

Collection features works by artists represented by Gladstone’s Influential Gallery.

The 1981 painting-unseen for over three decades-is estimated at up to $15 million, topping a week of high-stakes sales ...

Twelve works from the late dealer's private holdings will be auctioned during May's marquee sales in New York.

Sotheby's to sell 12 artworks from Barbara Gladstone's collection in May, including works by Andy Warhol, Richard Prince, and ...