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5- Owen Walker
In 2008 Owen Walker admitted to conducting cyber-attacks on multiple organizations over many years as well as leading an international hacking organization. He was also responsible for creating a virus that allowed him to take over millions of people’s computers. These hijacked devices made conducting criminal activities easy and untraceable.
According to experts, between his virus and the attacks he conducted, Walker cost his target organizations an approximate $26 million in damages. However, despite his multiple crimes Owen Walker has yet to be convicted. The judge taking into consideration his young age opted to discharge him.