Until very recently I worked for IBM as a Consulting Security Specialist, based in central London. I have worked on a number of IBM red books over the years, but most recently I has part of the team who wrote Integrating IBM Security and SAP Solutions. Now I work as an independent IT/Security consultant.
Over the years I have worked hands-on with most of the current IBM Security Systems products (see https://www.ibm.com/security/). Before that I worked on IBM’s mainframe cryptographic products and as a networking specialist. Before joining IBM I worked as a software engineer, writing real-time communications software for networking products and telephone exchanges in the US and the UK.
(I studied Engineering at the University of Cambridge, but that was a long time ago.)