Who's the guy who did those Alien Workshop graphics?

As a kid i was always fascinated by the sharp & clean artwork that Alien Workshop had and still has. I tried to find out who was responsible for the majority of it untill recently i chatted with someone who told me to check out Don Pendleton.
Pretty curious i hit up Google and found his site and was transported back in time seeing all the graphics and stuff.
Also i found this video on Youtube called the "Three Beasts" which shows Don Pendleton working on and explaining his graphics and workmethod, very interesting to watch.