Maartensz is an alias of a Dutch logical philosopher and
psychologist. He lives in Amsterdam, in the Netherlands and is in his middle sixties. He is the writer of the Philosophical Dictionary.
He also maintains a large website at two places, that mirror each other:
Here you find quite a lot
computing and M.E. The last is an acronym for the disease Maarten
has since 1.1.1979.
The best short surveys,
its contents and its size is the site-map and
directories listing. There also is a Tour of the site
that gives a more comprehensive and detailed version and there is an
system for the site.