Network World : 12 "White Hat" hackers you should know

I would just suggest you look at this and read about these people. Also note that many "White" hats used to be "Black" hats.
Drat! Just realized that some of you may not understand those terms.
3 Classes of Hackers:
"White" hat - These are the good guys, many are running companies making products to protect us.
"Gray" hat - Not good, but not bad, these guys work on the outside, many times are just curious and want to see if they can.
"Black" hat - These are the bad guys. They do things because they can and want to do harm and in many cases are doing it to extort money from someone.


http://www.networkworld.com/slideshows/2010/041510-white-hat-hackers.html#slide1