Jon Jagger is a software consultant specializing in practice, process, test driven development, and complex-adaptive systems-thinking. He helps teams improve their effectiveness at collaboratively developing software. Hire him! If you don’t like his work he won’t invoice you. He's 30 years old (hex) and he's loved software since he was 10 (decimal). He built cyber-dojo.org to promote deliberate practice for software developers. It's an open source project, and if you're a commercial organization making use of the public server you need a license, and all the money raised goes to a charity he has setup which buys Raspberry Pis for kids. He's an author, former conference chairman, and a proud father and husband who loves coarse fishing and salmon fishing and lives in Somerset, England.