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Noia 64 apps karm.png This user has been on Commons for  13 years, 11 months, and 19 days.
Gnome-emblem-photos.svgThis user has uploaded 4.605 files to Wikimedia Commons.
41,171+This user has made over 41,171 contributions to Commons.
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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.

Live and work, contributions to Wikipedia, and more specifically to Commons[edit]

After studying mechanical engineering, business administration and art I started in the early 1990s developing concepts across the fields of art, science, design and organization. This began with basic intuitive fascination for such things as expression, life, creation and destruction, and turned into investigating the process of systematization and visualization and the creation of a systematic world view.

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.

Most of the earlier photography is about people and events in the world of art and design in the 1990s. Hereby a smaller part is the upload of some of my work as a professional artist, which serves a dual purpose. If have been creating art and design for a period of just ten years from 1991 tot 2001 in practically all fields of visual art, hereby cooperation with a significant number of artists and designers. All together a little over 100 artists, designers and scientists have been represented. The presentation of a number of my own works gives both and introduction to this work, and serves as experiment to classify and present works of art and design in a coherent and representative way. In my later conceptual enterprises this is one of the main topics of research, coherent global representation. That has been the reason why I had started organizing the Wiki Commons category structure on diagrams in the first place.

Contributions (selection)

Commons contributions : Galleries

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

Software and enterprise engineering illustrations

Philosophy of science illustration

Documentary pictures

Commons contributions : Categories


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]