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Noia 64 apps karm.png This user has been on Commons for  11 years, 6 months, and 9 days.
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Marcel Douwe Dekker (Mdd) (Delft 1964), Dutch systems engineer and conceptual artist participating in Wikipedia, Wikicommons, Wikiquote and Wiktionary, who started at the Dutch Wikipedia in September 2004.

I am a professional artist working as conceptual artist, photographer, design, writer, organizer and lecturer since 1992. As I wrote on my homepage some years ago:

Central theme of my work is the development of concepts across the fields of art, science, design and organization. This started with just basic intuitive fascination for such things as expression, life, creation and destruction. Searching to express these intuitve fascination turned into experimenting with media and further developing concepts across the disciplinary fields. Eventually in recent years this work turned into investigating the process of systematization and visualization”
—Marcel Douwe Dekker, Rotterdam 2010. .

The contributions I make to Wikipedia and Wikimedia Commons are part of my research & development as independent artist, in which I try to improve the representation on Wikipedia and Wikimedia Commons at the same time. I have uploaded over 3000 images here to Wikimedia, a large part just moved from Wikipedia, and another part found in older or new online source. Also, in 2008, I significantly contributed to the creation of categories for all diagrams with over 20.000 edits. This is part of the 150.000 contributions in total I made to several Wikipedia projects over the years. Over the years I started and developed a series of galleries at commons, which are intended to give an overview both thematically and historically of the particular subjects. This can be helpful to structure the representation of those subjects in corresponding Wikipedia articles.

Due to a lack of illustrations in particular fields of the formal sciences, I have been creating a series of illustrations. In between I have done some documentary and portrait photography for Wikipedia . Recently, I have been donating some of my earlier photography from the pre-internet era (and have been writing corresponding Wikipedia articles). In recent years, focusing on the Netherlands, Wikimedia Commons has been granted a large donation of black and white images from social, political and cultural events. I think there are still large gabs of more recent pre-internet events. It would be great if we together continue to make Wikimedia Commons a place to represent this era, and collect images of notable events.

Commons contributions : Galleries[edit]

Main Chart, Diagram, Map and Technical drawing
Management, economics and other societal modelling
Main Economic diagram, Management diagram
Systems and software engineering
Technology and technical visualisation
Other galleries


Commons contributions : Images[edit]

Software and enterprise engineering illustrations[edit]

Philosophy of science illustration[edit]

Documentary pictures[edit]

Commons contributions : Categories[edit]


Scientific books

Scientists categories

Systems theory

Systems theory categories

Systems engineering Categories

Software engineering

General categories

Specific software engineering diagram categories


General categories

Specific categories

Visualization history



See also[edit]

External links[edit]