4. Robert Tappan Morris
A graduate student at Cornell University, Robert Morris developed the first computer worm. According to his own statements, he wanted to capture the size of the Internet. After he set the software on November 2, 1988 free, he infected 6,000 computers -which were then about 10 percent of Internet-connected computers.
Due to a programming error, the worm multiplied excessively and made sure that many computers were overloaded. 1989, Morris was the first to be convicted under the Computer Fraud and Abuse Act of 1986. SEE ALSO: Top 10 richest drug dealers of all time – Guess who’s #1?? (+Photos)