I did my PhD
at the Sterrewacht Leiden, on Radio
Investigations of Clusters of Galaxies with Prof H.
van der Laan as supervisor (1978), studying the intra cluster medium,
cluster radio haloes and
head-tail radio sources.
After that, I worked on X-ray astronomy (Einstein obervatory,) and
optical surcface photometry, studying
cooling flows, at the European Southern Observatory in Geneva and
Garching, Munich. At ESO I
was chairman of the working groups
supervising the development of the MIDAS image analysis
system.
In 1984 I returned to the Netherlands to help building up the
new UK-NL optical observatory at La Palma (Canarias) and studied
dark matter
in dumbbell and cD galaxies.
In 1989 I published with A. Lauberts the first large digital image
survey (ESO-LV), which led to my paper on the opacities and dust
content of spiral
galaxies (Nature 1990).
During the 90's I worked at SRON-Groningen and ESA Villafranca-
Madrid
to
build and commission the Infrared Space Observatory (ISO)
satellite's Short Wave Spectrometer, which I used to pioneer the
dectection of cool extragalactic molecular hydrogen- unseen matter in
the universe. Since
1998 I work at the Kapteyn Institute for the OmegaCAM
project which led
to the founding of the OmegaCEN data center . My current research
interests focus, apart from dark matter, on the information
theory of the universe and data modeling abstractions.