David Hook has been writing software in a variety of domains and languages for the last 20 years. He has worked with Java since 1995, originally doing medical imaging before moving into cryptography and security a year or so later. In April 2000, he co-founded the open source Bouncy Castle cryptography project and has played an active role in it ever since. He currently works as a freelance consultant, mainly in Java, doing the odd bit of lecturing and writing on the side. When he is not using his spare time to work on Bouncy Castle, he spends it pursuing his other interest in computer graphics. He lives in Melbourne, Australia, with his most patient wife Janine and a cat named Hamlet, who really seems to think he’s a little cryptographer in a fur coat. David can be reached at dgh@bund.com.au.