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Kossmann.dejong

Amsterdam-based design studio creating story-driven spatial experiences, exhibitions and museum interiors.

Last updated September 26, 2026

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Overview

Kossmann.dejong (often abbreviated KDJ) is a Dutch design studio specialised in exhibition design and story-driven spatial experiences, based in Amsterdam. The studio was founded in 1998 by Herman Kossmann and Mark de Jong and works on both Dutch and international projects, particularly in Europe and Asia. Its international team consists of designers, content developers, producers and supportive staff. The studio describes itself as an experienced and ambitious design studio specialised in creating captivating story-driven spatial experiences. It positions its work as a purpose-driven practice committed to telling urgent and relevant stories — whether historical, scientific, social or commercial — and transforming them into stories that matter. KDJ argues that spatial stories can be transformative: they inspire exploration, ignite wonder and nurture critical thinking, offering an oasis of focus and nuance in an increasingly complex and noisy world. KDJ's services span the entire process from strategy to production. Its capabilities include strategy, master planning, strategic consultancy, concept development and production. The studio works for cultural institutions as well as commercial and societal organisations, partnering with global brands, institutions, NGOs and museums. Every project is described as a co-creation. Notable projects include exhibitions at the Stapferhaus in Lenzburg, Switzerland; the Museet for Søfart (Danish Maritime Museum) in Helsingør, Denmark; the Portlantis visitor centre in the Port of Rotterdam; the Groote Museum of Artis in Amsterdam; the Florence Nightingale Museum in London; and the permanent exhibition of the Nationaal Militair Museum in Soest, the Netherlands. Kossmanndejong has received several international awards for exhibition design, including European Design Awards, Red Dot Design Awards and various nominations for the European Museum of the Year Award. The studio emphasises sustainability as more than choosing the right materials, weaving it into daily practices, the stories it helps tell and the way it designs, with the goal of maximising positive impact while minimising its footprint on the planet.

History

Kossmann.dejong was founded in 1998 by Herman Kossmann and Mark de Jong as a Dutch design studio specialised in exhibition design. Based in Amsterdam, the studio grew into an international practice working on projects in the Netherlands and abroad, particularly in Europe and Asia. From its early years, KDJ focused on the development and realisation of spatial experiences in which content and design are combined. Rather than treating exhibition design as purely visual, the studio built its practice around the idea of the 'spatial story' — a narrative experience that guides visitors through a space and communicates complex, sensitive or contested content in an accessible, memorable and shareable way. Over the years the studio expanded its portfolio to include exhibitions, museums, visitor centres and temporary presentations, serving cultural institutions as well as commercial and societal organisations. Notable projects include various exhibitions at the Stapferhaus in Lenzburg, Switzerland; the Museet for Søfart in Helsingør, Denmark; the Portlantis visitor centre in the Port of Rotterdam; the Groote Museum of Artis in Amsterdam; the Florence Nightingale Museum in London; and the permanent exhibition of the Nationaal Militair Museum in Soest, the Netherlands. The studio's work has been recognised with several international awards for exhibition design, including European Design Awards, Red Dot Design Awards and various nominations for the European Museum of the Year Award. KDJ describes itself as a purpose-driven team committed to telling urgent and relevant stories — historical, scientific, social or commercial — and to using the power of spatial storytelling for the better of society. It also emphasises sustainability as a principle woven into its daily practices, the stories it helps tell and the way it designs.

  • 1998

    Kossmann.dejong founded by Herman Kossmann and Mark de Jong.

  • Designed exhibitions at the Stapferhaus in Lenzburg, Switzerland.

  • Designed the Museet for Søfart in Helsingør, Denmark.

  • Designed the Portlantis visitor centre in the Port of Rotterdam.

  • Designed the Groote Museum of Artis in Amsterdam.

  • Designed the Florence Nightingale Museum in London.

  • Designed the permanent exhibition of the Nationaal Militair Museum in Soest.

  • Received international awards including European Design Awards and Red Dot Design Awards, with nominations for the European Museum of the Year Award.

Products and positioning

Purpose-driven design studio creating authentic, lasting visitor experiences through story-driven spatial design, combining creativity and playfulness with serious content.

  • Stapferhaus exhibitions

    Various exhibitions at the Stapferhaus in Lenzburg, Switzerland.

  • Museet for Søfart

    Danish Maritime Museum in Helsingør, Denmark.

  • Portlantis visitor centre

    Visitor centre in the Port of Rotterdam.

  • Groote Museum of Artis

    Museum in Amsterdam.

  • Florence Nightingale Museum

    Museum in London.

  • Nationaal Militair Museum permanent exhibition

    Permanent exhibition in Soest, the Netherlands.

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