Justin K. Thannhauser

The Dealers who shaped Art History Vol. 5

June 27, 2026

At Ward Moretti, we believe that art history isn’t just written by artists and collectors, but also by the dealers who connected and supported them. These figures did more than sell paintings; they steered taste, built markets and helped form the institutions we now revere.

Much of our work as art dealers and agents involves sifting through archives to uncover the histories of the paintings we handle, and we often rely on the detailed (and sometimes colourful) records left by dealers. This series celebrates their significance, each instalment focusing on one dealer who helped shape the story of art.

Today, we turn to Justin K. Thannhauser, who was among the most influential art dealers and collectors of the twentieth century. Born into a Jewish family of art dealers, he became one of the great champions of modern art, handling work by Picasso, Matisse, Monet and Gauguin. Between Munich, Lucerne, Berlin, Paris and New York, his legacy remains closely tied to the global rise of Modernism.
Pablo Picasso, Woman with Pears, Oil on canvas, summer 1909, Horta de San Joan, Number 52 in the 1913 Ausstellung Pablo Picasso. MoMA, New York.

The rooms of Heinrich Thannhauser's Moderne Galerie

Thannhauser entered the art trade through his father, Heinrich Thannhauser, founder of the Moderne Galerie in Munich. It held some of the earliest exhibitions of contemporary German Expressionism alongside French modern art, including the New Artists' Association of Munich in 1909 and The Blue Rider in 1911, movements that would go on to define the avant-garde. The gallery was presented more like a museum than a commercial space. It was a place where visitors could learn, linger and be exposed to a wide range of European Modern art.

One of the most significant chapters of Thannhauser's career began in 1913, when the Moderne Galerie organised one of the first major Picasso exhibitions in Germany.
"It is widely believed that Picasso's work stands at the origin of the whole Expressionist, Cubist, and Futurist movements. In fact, Picasso has nothing to do with any of these, except that he did provide the initial artistic impulse; nor does he want to have anything more to do with them. What distinguishes him from all these movements, even at first sight, is that unlike them he has never expressed his artistic intentions in programs, manifestos, or similar pronouncements; he has simply painted."

Quote from Heinrich Thannhauser’s catalog for Picasso’s retrospective in 1913.
Exhibition catalogue cover, Ausstellung Pablo Picasso, and an accompanying note by J. K. Thannhauser, Moderne Galerie, Munich, February 1913.

The exhibition catalogue included the above preface, that set out to distinguish Picasso from his contemporaries, revealing the clarity of his understanding of the artist at a moment when Picasso remained largely misunderstood. This early advocacy marked the beginning of a lifelong personal and professional bond between Thannhauser and Picasso.
Thannhauser Gallery, Berlin, Special Exhibition with Paintings and sculptures by Braque, Picasso and Gauguin, 1927.

In 1928, the Thannhausers relocated their Munich gallery to the thriving art centre of Berlin. As the capital of the liberal Weimar Republic, Berlin in the 1920s was a dynamic cultural hub, embracing audacious art and transgressive lifestyles. There, Justin Thannhauser organised significant exhibitions including a tribute exhibition to Claude Monet in 1928, followed by an exhibition of Henri Matisse in 1930, the largest presentation of his work in Germany at the time. These experiences gave Thannhauser both the intellectual grounding and the international network that would sustain his career for decades to come.
Sitting room of Justin and Käthe Thannhauser’s resisdence at 12 east 67th street, New York, with works by Van Gogh, Gauguin, and Pissarro, c.1957.

Exile from Europe, then reinvention in New York

The Thannhauser Galleries were among countless cultural institutions targeted by the Nazi regime during the 1930s. Art of the avant-garde — which filled most of the gallery rooms — was branded as degenerate, and mounting pressure from the regime eventually forced the Berlin gallery to close. Fleeing persecution, the Thannhausers escaped with a few pictures from their collection and made a desperate journey across Europe. Under extreme pressure from the regime, Justin's father Heinrich died of a heart attack at the German-Swiss border. Paris offered only temporary refuge, and in 1940, following the fall of France and the loss of Thannhauser’s entire inventory, he and his family left for New York.
In many ways, these experiences were a part of why he went from being a traditional gallery owner into something closer to a private collector, advisor and intermediary. Rather than reopening a commercial gallery, Thannhauser and his wife Käthe rebuilt his practice with discretion. He received visitors by appointment at his apartment on East 67th Street, where chosen guests could spend time with the collection he had carried with him from Paris. It was less like visiting a dealer and more like being welcomed into a private museum.

It was through this arrangement that Thomas Messer, who lived across the street, came to know the pictures. The then-director of the Guggenheim was taken with what he saw, and in time introduced Thannhauser to the Guggenheim Foundation. The consequences proved lasting since a large number of important works from the Thannhauser collection were gifted to the museum in 1965 and have been on continuous display, honouring his one enduring condition, that the collection should never be on view at the same time.

As well as being a dealer, Thannhauser was a passionate collector and certain works followed him across Europe and America. One such piece was Picasso's Saltimbanques, an etching he acquired during his time in New York. In the early 1970s, when he and his second wife Hilde went to live in Switzerland, he brought his collection of classical modernist works with him. The etching hung in his bedroom and the inscription on the reverse 'not for sale', is a testament to the high esteem with which he held it.
Pablo Picasso, Saltimbanques, from La Suite des Saltimbanques (Bloch 7; Baer 9), 1905, Drypoint etching on Arches paper, Pre-steel facing, printed by Eugène Delâtre, signed and dated lower right.

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Pablo%20Picasso%2C%20Saltimbanques
Installation view of the Erste Sonderausstellung in Berlin, featuring works by Vincent van Gogh, 1927.

Van Gogh and the Guggenheim

In his later life, Thannhauser's role shifted from being a dealer to custodian. He was a collector and benefactor who had spent decades assembling one of the great private holdings of modern art.

Over the course of his career he purchased, traded and held on consignment works of the highest importance, among them no fewer than 107 pictures by or attributed to Van Gogh. Thannhauser understood that building a market for Van Gogh required more than simply hanging pictures on a wall. It was his sophisticated and forward-thinking approach to art dealing that helped cement Van Gogh's reputation in Germany at a time when modernism was deeply unpopular with both the Kaiser and later, the Nazi regime. By the time prices for Van Gogh's work had risen dramatically in the 1920s, Thannhauser was well positioned as a key figure in the international market, selling works across Germany, Paris and eventually New York.
His most enduring act of generosity was the gift of major works to the Solomon R. Guggenheim Foundation, ensuring that the collection he had built with such care would remain in public view. In fact, his legacy partly lies in what he didn’t sell and preferred to carry with him across borders and decades of upheaval. Today, those works form one of the most beloved collections in the Guggenheim Museum’s holdings.
- Justin K. Thannhauser (right) and Hilde reviewing a scale model for the installation of the Thannhauser Collection at the Solomon R. Guggenheim Museum.
- Installation view, Thannhauser Collection, Solomon R. Guggenheim Museum, New York.
Legacy

His life was a remarkable testament to resilience, from being forced to abandon his galleries, flee his home and rebuild from nothing, not once but several times over. He always found new ways to champion the art and the artists he believed in. He died in Gstaad in 1976, at the age of eighty-four, surrounded by those who loved him.

As a final act of devotion to his memory, Hilde organised an exhibition of their private collection called Sammlung Justin Thannhauser at the Kunstmuseum Bern in 1978, bringing together twenty-nine paintings and works on paper by Picasso, alongside masterpieces by Cézanne, Gauguin, Van Gogh, Renoir and Seurat.
Pierre-Auguste Renoir, Etude de femme ou Jeune fille, c. 1890, pencil and chalk on paper mounted on cardboard, 28.5 x 20 cm, part of Thannhauser’s collection exhibited at the Kunstmuseum Bern in 1978.

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Pierre-Auguste%20Renoir%2C%20Etude%20de%20femme%20ou%20Jeune%20fille
Today, his name endures not only in the galleries and the archives, but in the provenance of works in private collections across the world.
Further reading:

M. Drutt, Thannhauser: The Thannhauser Collection of the Guggenheim Museum. New York, Solomon R. Guggenheim Foundation, 2001.

S. Koldehoff and C. Stolwijk, The Thannhauser Gallery: Marketing Van Gogh. Brussels: Mercatorfonds; Amsterdam: Van Gogh Museum, 2017.