John Flowers is the author of Linux Security and Linux Enterprise Security published by New Riders and Pearson Education respectively. He also gave a talk at DEFCON 8 entitled "Network IDS - Do Not Bend, Fold, Spindle or Mutilate."
Once said "Ok well the guy who wrote Snort shut the fuck up."
Really doesn't like the guy who wrote Snort
https://www.defcon.org/html/links/dc-archives/dc-8-archive.html#Flowers
http://scrye.com/~kevin/lsh/feb-02/Security-HOWTO-11.html