Stu Henderson has been working with mainframe computers for over 30
years, as a system programmer, consultant, security administrator,
and auditor.  Since 1990 his firm, the Henderson Group, has provided
training, consulting, and audit technical assistance to help
organizations to improve their information security.  He is editor of
the RACF User News and the Mainframe Audit News newsletters (to
subscribe, see his website http://www.stuhenderson.com).  He speaks
frequently to organizations such as ISACA, SHARE, and the Vanguard
conference.  His information security and IT audit seminars are
offered across the country.  He teaches CISA prep classes for his
local ISACA chapter.