John P. Jeffries has lived in the southeast of England for most of his life. Although predominantly based in London, he has worked in many countries around the world. He enjoys travel and is the Director of his own consultancy business: www.spirotek.co.uk.

Originally from a development background, he has worked for a number of global software companies including Oracle Corporation and Siebel Systems. His time at Siebel was spent designing and developing ETL solutions for Data Warehouses, ultimately enhancing the eBilling and Billing Analytics products with an Oracle Warehouse Builder based API. He spent six years working in Oracle Consulting in EMEA and Oracle Advanced Customer Services in the UK as a Senior Principal Consultant, earning the internal title of "The UK's Data Replication Expert". Now a freelance consultant, the author can be found onsite in many of the world's most respected financial institutions in London, consulting on Oracle GoldenGate, Streams, and Active Data Guard. With over 15 years of Oracle experience, and an OCP since Oracle 8i, the author has extensive knowledge of Oracle databases, including Enterprise Linux and RAC, coupled with the ability to design and build high performance distributed database systems. He has trained internal and external clients in Data Warehousing and Data Replication techniques, and continues to share his knowledge and experience through his own website: www.oracle11ggotchas.com.