Just an observation in case we do contact him - somebody should take a look at the Wikipedia articles about him to make sure they aren't problematic. Otherwise we might find that his willingness to help evaporates.Harel, this Wikimania is anyway highly influenced by politics, no
matter what we want; which includes this thread. If Sari Nusseibeh is
willing to help, you should take that help. I am sure that he is a
reasonable person, who would try to avoid making possible problems to
us.
Small Disclaimer here: I don't know the guy personally, I got his name from contacts of contacts. Thus I can't vouch for his willingness to help. I think there is a big chance he will be though.