Probably Australian studio glass. I've looked through the
list of Jam Factory Alumni (the Jam Factory being the most significant Australian school and studio), but I couldn't see any names that seemed to match. (there are lots of famous makers in that list, starting with Sam Hermann and through to Nick Mount, Matt Larwood, even Eileen Gordon).
There's also the
Ausglass site, which has lists of active studio glassmakers. It couldn't be Keith Rowe, could it?
http://www.krglass.com/index.html You'd have to email him to find out, but it's the closest signature match I can find. It may be way off the mark.
Later: No, I take that back. Very unlikely that signature is "Rowe".