Tom Kyte is a senior techical architect in Oracle Sever Technology Division. Before Oracle, Tom was working as an big-scale heterogeneous databeses and applications integrator, mostly wroking for military and government clients.
Today, Tom is spending a lot of time working with Oracle databases - to be more precise - with people working with Oracle databeses. Besides that, Tom is behind AskTom columns in Oracle Magazine, answering questions regarding Oracle databases and it's tools. Tom is also an author of Expert Oracle Database Architecture (Apress, 2000.), Expert One on One Oracle (Wrox Press, 2001 / Apress 2004), Beginning Oracle Programing (Wrox press, 2002 / Apress 2004), and Effective Oracle by Design (Oracle Press, 2003). Those are all books on the general use of databases and how to develop succesful Oracle applications.