Pen Testing Skills

[Steven Boshuizen]

In my understanding people with these skills come 
from a UNIX background, having worked on projects 
with VPN's, intrusion detection, administering and 
implementations. Could anyone tell me that if I was 
looking for a shit hot penetration tester what sort of 
background would such a guy have, and what would 
be the keyskills/ buzzwords that I would have to look 
for so that I would know I am talking to an ace?? 
Would appreciate any assistance.