There is no way of knowing how he will pronounce his name. If you cannot ask him directly, then ask one of his friends.He's American completely but to google the name it seems it is German in provenance.
I would ask him and I think I will if I can, nonetheless could someone suggest how it should be pronounced under the standard american system of pronunciation? I have to present him at a conference but I am not sure whether I will have time to meet him before hand. If I make an egregious error I'd embarrass us both.