BruceSchneier is founder and CTO of Counterpane, an Internet security firm: http://www.counterpane.com
Author of AppliedCryptography, SecretsAndLies, and BeyondFear. He's a frequent critic of poor security practices. It may appear that his primary focus of criticism is MicrosoftSecurity, but they are the largest target around. To be fair, he has given them due credit for their good security practices, too.
He has a blog: http://www.schneier.com/blog/
And publishes a free monthly newsletter: http://www.schneier.com/crypto-gram.html
Viewpoints
Praises for matters related to MicrosoftSecurity
"Instead of making promises I didn't believe (Gates) could keep, he was demonstrating substantial improvement in many areas that are important, like internal development processes,"
"MS has reasons to delay TrustworthyComputing document publication date so WindowsVista is not affected?". See more at Aug05 writeup at http://news.zdnet.com/2102-1009_22-5844520.html?tag=printthis