Charles worked recently in the Department for Business, Innovation and Skills of the United Kingdom Government for 12 years, and is a Professional Electronic Engineer. He previously was Head of Security for one2one (now T-Mobile UK), and worked within British Telecom for twenty years before that. He has worked in many security areas over the last 30 years, and mobile radio for over 25 years. He is runs his own Company, Zeata Security Ltd and works with others in Azenby Ltd specialising in mobile security.
He has been Chairman on the GSM Association Security Group for over 20 years. He has been working the GSM and 3GPP security standards, first chairing the Algorithm Expert Group way back in 1986. He is Chairman of the NISSG, a group that was set up to co-ordinate security standards amongst the three European Security Standards Organisations and other bodies outside Europe. He is also Chairman of ETSI OCG Security, which is responsible for security within ETSI, which sets Telecoms Standards within Europe. He was on the Permanent Stakeholders group of ENISA, The European Network and Information Security Agency.