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Walter O'Brien is a famous computer person, commonly known as the CEO of Scorpion Computer Services. O'brien is a computer scientist by education, who has a Bachelor of Science degree in computer science and artificial intelligence from the University of Sussex. He even completed a second college at St Kieran's College in Kilkenny. So it is safe to assume that Mr. Walter O'Brien Scorpion (nicknamed Scorpion after his hacking alias) knows many things about computers. Well the truth is, his knowledge is big enough that it can fill volumes of pages from a novel. And the fact is that it has. His life serves as an inspiration for the CBS series Scorpion, which he also co-produces.
Interesting to know is the fact that Walter O'Brien used to be a hacker since the age of 11, when he hacked into NASA's server and was almost extradited. But instead, he offered to improve the security of NASA and was pardoned by Homeland Security. His set of extraordinary abilities has made him a a white hat person, since his primary focus was always with good intention - strengthening the security of valuable assets on the internet.
Walter today uses Mozilla's Firefox browser cause he likes the customization and the addition of addons which make the whole thing even more powerful.