Maarten Maartensz is an alias of a Dutch logical philosopher and psychologist. He lives in Amsterdam, in the Netherlands and is in his early fifties. He also maintains a large website:
Here you find quite a lot about philosophy, logic, computing (including about 1 MB of text about Squeak) and M.E. The last is an acronym for the disease Maarten has for 25 years now.
Maarten's main limitation as regards Squeak - apart from his disease - is that he knows Squeak since July 7, 2001. He wrote Squeak Help because nobody else did it and because he likes Squeak a lot.