My wife and I live in the Netherlands. My main hobbies are photography, chess, and traveling. I am far from a professional photographer, but I just want to record the beauty of nature and architecture we encounter on our trips and travels. Before my retirement I was a mathematics professor at the university of Amsterdam.

Senna is the name of the first and second Bernese (Bernersenne dog) we had in the past. During their life time they were my "alter ego", so I borrowed their name.