Willem de Kooning (1904–1997)

We authenticate, certify, issue Certificates of Authenticity (COA), appraise, and facilitate the sale of paintings, drawings, and prints by Willem de Kooning.

Willem de Kooning was a Dutch-born American artist and a defining force in the development of Abstract Expressionism. Born in Rotterdam, he trained in classical techniques before relocating to the United States in 1926. In New York, he became part of a groundbreaking circle of artists who reshaped modern art in the post-war era. De Kooning’s work is particularly notable for its ability to move fluidly between abstraction and representation, setting him apart from many of his contemporaries.

His paintings are recognized for their vigorous, gestural application of paint, complex layering, and constant revision. De Kooning’s celebrated Woman series challenged traditional depictions of the figure, while his abstract works explored rhythm, structure, and movement. Across decades, his style evolved from dense, aggressive compositions to more open, luminous works, reflecting a continuous process of reinvention.

AI-Assisted Research and Expert Authentication

Determining the authenticity and value of a work attributed to Willem de Kooning requires a multidisciplinary approach.

Our process combines visual analysis with documentary research and scientific examination. We compare stylistic elements, materials, and construction techniques with known works, while also investigating provenance through archives, exhibition records, and catalogue raisonnés. Where necessary, scientific methods such as pigment testing and imaging technologies are employed.

AI supports our team by verifying factual information, organizing data, cross-referencing sources, and identifying relevant materials. It functions strictly as a research tool.

AI has no capacity for interpretation, judgment, or aesthetic evaluation. It cannot determine authenticity. All conclusions are reached solely by experienced human specialists.

Clients receive a comprehensive report and, when appropriate, a Certificate of Authenticity. We also provide valuations for insurance, resale, estate, and legal purposes.

Reviewing Previously Rejected Willem de Kooning Works

Works attributed to De Kooning are frequently declined by auction houses due to insufficient documentation or uncertainty surrounding attribution. This does not necessarily indicate that a work lacks merit.

A thorough re-evaluation can clarify authorship. Our specialists reassess materials, technique, and historical context, comparing each work against established examples. Through detailed analysis and research, we provide the professional documentation required for reconsideration by major institutions and the market.

If you own a painting or a drawing by or attributed to De Kooning, we would like to learn about it. Please send us photos or contact us at [email protected]. You will generally receive a response within 24 hours.