> > I also assume it is especially difficult to get the visa for folks who > > are not US citizens. > > why would that be? Different visa requirements apply to citizen of different countries, depending of the particular treaties between these countries and France. The requirements are based on the nationality of the visitors, not on their countries of residence. This can lead to problems when US residents who are not US citizens travel abroad, as their travel organizers may wrongly assume that they don't need a visa. I had a quite vivid personal experience about 10 years ago, when my lab invited a distinguished scientist to give a keynote to a conference in France. He flew from the US, showed his passport to the immigration officer, and was immediately placed in detention -- he had a Latin American passport and no visa. That particular incident ended well, as we used the ministry of research hierarchy to intensely lobby the immigration services. He was eventually granted a visitor's visa. -- Christian Huitema _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf