Martijn Verburg (aka 'the Diabolical Developer'), CTO of jClarity, herds Cats in the Java/open source communities and is constantly humbled by the creative power to be found there!
Currently he resides in London where he co-leads the London JUG (a JCP EC member), runs the Adopt a JSR and Adopt OpenJDK programs and drinks good beer at his local pub. You can find him on-line facilitating development of FOSS projects (PCGen and Ikasan), moderating at the Javaranch or discussing (ranting about?) subjects on the Programmers Stack Exchange.
He's become a regular (diabolical) speaker at conferences on Java, FOSS and software development and has recently wrapped up his first Manning title - "The Well-Grounded Java Developer" with his co-author Ben Evans.