Derrin Kent describes himself as a cross between a trainer, a manager, a linguist, and a geek. Managing Director of TDM (http: //tdm.info), Derrin has a Master's level teaching qualification from the University of Cambridge (DTEFLA) and is also a Linux-Certified professional (LPIC). A jack-of-all-trades in open source software, Derrin has extensive Moodle experience (already a reviewer of two Packt books on Moodle) and speaks both Spanish and English at home with his Peruvian wife and two bilingual children.