He was apparently an early contributor to Unix and will be remembered for the password system and security.
Here is the link.
[Early UNIX Contributor Robert Morris Dead at 78 - Slashdot](http://it.slashdot.org/story/11/06/30/203224/Early-UNIX-Contributor-Robert-Morris-Dead-at-78?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Slashdot%2Fslashdot+(Slashdot)<br /><br />https://secure.wikimedia.org/wikipedia/en/wiki/Robert_Morris_(cryptographer))
It is indeed quite funny that his son has some sort of fame too. He is the first human being to created a computer worm.