[csydas]

I think it is somewhat understood and well accepted that much of the tech world is done in English, even by non-native speakers. My company does all of it's trainings in English even though the presenters are not native speakers. Strong technical background will overcome language barriers and people are usually willing to look past any difficulty in understanding as long as the content is strong. Keep in mind that this has the corollary that the audience has to understand the technical aspects well enough to absorb the new information in order to overlook any language difficulties. They need not be experts, but at least know enough to be educated on the subject.