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Noia 64 apps karm.png This user has been on Commons for  15 years, 3 months, and 8 days.
Gnome-emblem-photos.svgThis user has uploaded 4.605 images to Wikimedia Commons.
41,171+This user has made over 41,171 contributions to Commons.
MedCom laurel.svgThis user believes in assuming good faith and civility.
Red copyright.svgThis user respects copyright, but sometimes it can be a major pain.

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.

Life 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 as artist and designer 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 7.500 images here to Wikimedia, some scant from books, other moved from Wikipedia project. Most of these image have been copy/pasted from older or new online source after extensive search, which I call image scouting. Also, I contribute to the Commons organization through categorization. I started in 2008 when I significantly contributed to the creation of categories for all diagrams with over 20.000 edits. This is part of the 250.000 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 my 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. As a start a little over 100 artists, designers and scientists have been represented, which has continued to expand working along this bottom up approach. The presentation of a number of my own works gives both an 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.

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
Cognitive science
Specific types of economic activy and organisation


Commons contributions : Images[edit]

Software and enterprise engineering illustrations[edit]

Philosophy of science illustration[edit]

Portrait and documentary pictures[edit]

Commons contributions : Categories, selection[edit]


In the listing below there is short selection of the categories I created on Wikimedia Commons for documentation and information retrieval purposes. The first category I created was the Category:Systems biology on 14 May 2007. In those early years I focused on the interdisciplinary field of systems theory and the fields of visualization. It was the challenge to divide categories in such a coherent way, that the whole scope of science and visualization was covered in such a way that information retrieval is optimized. In those early years a global categorization bone structure was developed, which most of it has lasted so far and I guess has prove its usefulness.


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



Further contrbutions in the field of categorization

Over the years by times I have kept contributing to Commons uploading images, and creating the accompanying Wikimedia Commons categories to store those images in the process. By autumn 2021 I have created over 3.000 categories, and multiple other category bone structures. In a way these categories map more specific fields of science and society. I believe this to be a never ending story to satisfy the growing need to keep Wikimedia Commons a nice place to look around.

See also[edit]

External links[edit]