I have a chance to buy this one as well but I don't know who it is and this will be my last post because I'm going home after this one! Germany signed looks like the name is Romberg?
If you're willing to do a little research, I suggest you contact the Weber company in Germany. I believe the email address on the reference below will get you to the company who framed the pic--and that should lead you to the artist .
Good luck,
Don...... Google Translate