Brian Jepson maintains a keen focus on the sparks that fly where two cutting edges meet. Some of his favorite intersections are Mac OS X (where a solid Unix core meets the pioneering Apple user interface), Mono and Portable.NET (where Open Source meets Windows), and Rotor (where Microsoft shares a bunch of code with y'all). Brian is also an O'Reilly editor and co-author of Mac OS X for Unix Geeks and Learning Unix for Mac OS X.