Jonathan Lewis is a well-known figure in the Oracle world with more than 31 years experience using the software. He has published three books about Oracle - the most recent being "Oracle Core" published by Apress Nov 2011 - and contributed to three others. He runs a couple of websites and contributes fairly regularly to newsgroups, forums, and User Group magazines and events around the world. Jonathan has been self-employed for most of his time in the IT industry. For the last 20 years he has specialised in short-term assignments, typically of a design, review, or trouble-shooting nature. He runs seminars about using Oracle all over the world and has visited more than 50 different countries to talk about, or trouble-shoot, Oracle systems.