It's never easy to come up with <A HREF="http://www.eweek.com/c/a/Security/The-15-Most-Influential-People-in-Security-Today/">a definitive list of IT professionals</A> with the most influence on the way we secure desktops, networks and mobile devices. And limiting the list to 15 hackers is a near-impossible task, but, in Ryan Naraine's mind, these are the folks who stand out today as stirring the imagination and forcing us to rethink our approach to security in an always-on world.