Mario Sierra

Mario Sierra has extensive experience in network support and infrastructure security, currently serving as Security & Infrastructure Network Support at Deutsche Börse since August 2006. Prior to this role, Mario worked as a Network Engineer at AT&T Global Network Services from 1999 to 2006, providing Tier II support for enterprise-level networks and managing key accounts. Mario's career in networking began at IBM Global Network Services as a Network Analyst, focusing on custom access management for Fortune 500 clients. Earlier, Mario served in the US Army from 1985 to 1998 as a Satellite Communications Chief, where responsibilities included installation and technical instruction related to satellite communications equipment. Mario's education includes training from Global Knowledge and the US Army Signal Corps.