Sebastian Bergmann works at eZ systems. In his spare time he wrote and maintains the PHPUnit project. (He's worked on other project but since that's what he's talking about at ZendCon, that's what we'll talk about)
The interview is only a few questions long, but it's interesting to see how Sebastian's talk will be heading. There'll be talk of PHPUnit 3 (still in beta), mock objects, and its integration with CruiseControl. Check out the post for more of the questions.