David works with the Worldwide Asterisk Community for Digium, and is an Asterisk enthusiast in addition to being a Chartered Engineer, globally experienced trainer and public speaker.
His experience includes Air Traffic Control communications, Wireless Local Loop, Mobile Networks, Computer Telephony, Voice over IP and Asterisk specifically.
In addition to many web articles, David's publications include Asterisk 1.4: The Professional's Guide (Packt, co-author) and the contribution of a chapter (on Internationalisation) to Asterisk: The Definitive Guide (O'Reilly).
David is editorially responsible for AstriCon (THE annual global Asterisk event) where he also introduced the 'Fastest Dude to the Dialtone' contest some years ago.
He is a frequent speaker at AsterConference Asia (David has also MC'd at this event), IT Expo (East and West) and a number of corporate events. He has also spoken at numerous other conferences - VoIP Developer, Speech World, CT Expo and UC Expo to name a few.