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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.

After studying 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.

Commons contributions : GalleriesEdit

Commons contributions : ImagesEdit

Software and enterprise engineering illustrationsEdit

Philosophy of science illustrationEdit

Documentary picturesEdit

Commons contributions : CategoriesEdit


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 alsoEdit

External linksEdit