After work

I'm the father of Rosanna since 21 November 2001. This is Rosanna and me at CWI's 2002 Christmas party (photo's by Jan Schipper):

I like juggling, calvin wants to juggle with chainsaws

and no, I don't do chainsaws (yet). But this is me juggling some tennis balls:
jacco juggling tennisballs on a wall I also like indoor climbing:
Jacco climbing pure chocolade (5a)
We climb on a regular basis with a group of PhD students and PostDocs in Klimmuur Amsterdam Centraal:
Dennis, Laura, Jeen, Arno and Jacco
(climbing photos taken by Amber Beckers.