This May, Sotheby’s New York will unveil the late Robert Mnuchin’s personal collection, a trove of postwar abstraction and modern art that has been quietly revered by collectors for decades. Comprising 24 works assembled with his wife Adriana, the consignment is anchored by Mark Rothko’s monumental Brown and Blacks in Reds (1957), estimated at $70–100 million, alongside a second Rothko from 1949, No. 1, estimated at $15–20 million.

Standing nearly eight feet tall, Brown and Blacks in Reds epitomizes Rothko’s luminous, stacked color-field technique from his most celebrated decade. Executed in a rare red palette, the painting was once part of the Joseph E. Seagram & Sons collection, preceding Rothko’s landmark Seagram Building commission. Sotheby’s notes that only fifteen monumental canvases were made in 1957, most now in museum collections, making this one a marquee opportunity for collectors.

Highlighting the New York School

Beyond Rothko, the auction showcases artists Mnuchin championed throughout his dual careers as financier and dealer, including Willem de Kooning, Franz Kline, and Jeff Koons. De Kooning’s Untitled XLII (1983), making its auction debut, exemplifies the lyrical intensity of the artist’s late period. Similarly, Kline’s Harleman (1960), a striking black-and-white canvas, stands as one of the most significant works by the artist to surface at auction in recent years.

Mnuchin’s eye for monumental, museum-quality works has long defined his reputation. By collecting rather than stockpiling, the Mnuchins kept only the highest-caliber works, a compact but supremely refined selection that demonstrates both discerning taste and a deep engagement with postwar abstraction.

A Market Moment for Blue-Chip Material

The timing of the sale is strategic: Sotheby’s enters the spring auction season following headline-grabbing results, including Gustav Klimt’s Portrait of Elisabeth Lederer ($236.4 million) and a white-glove modern/contemporary sale in London that achieved $175 million. The Mnuchin collection represents precisely the kind of trophy-level material that sustains confidence at the upper echelons of the market, providing a showcase for postwar American abstraction at its finest.

Sotheby’s plans an 11-lot dedicated evening auction in May, with additional works presented in day sales. The collection embodies the intersection of personal passion and market acumen, reflecting Mnuchin’s belief that “I’m really a collector at heart who happens to be a dealer.”

Robert Mnuchin: Collector and Connoisseur

Robert Mnuchin (1923–2026) was one of the art world’s rare figures to achieve distinction in both finance and art. After pioneering block trading at Goldman Sachs, he launched Mnuchin Gallery on Manhattan’s Upper East Side, curating museum-caliber exhibitions of Rothko, de Kooning, and other luminaries. Yet, Mnuchin consistently framed himself first as a collector, acquiring works for their intrinsic quality rather than market speculation.

The Mnuchin collection, intimate yet formidable, reveals an enduring devotion to the artists of the postwar New York School. Each canvas and sculpture is a testament to the couple’s refined sensibility, capturing the energy, experimentation, and emotional depth that defined an era. Sotheby’s upcoming sale promises not only a transaction but a rare chance to witness history passing from one generation of connoisseurs to another.