Roberts joined the computer network concept in the 1960s after reading the fateful J.C.R. Licklider paper about the concept of an "intergalactic computer network." When ARPA's Information Technology Manager, Robert Taylor, searched for someone to help paired ARPA survey computers together, he chose Roberts as the primary architect. Roberts couldn't handle it at all ̵
Roberts went to ARPA in 1973 (left Vint Cerf and Bob Kahn who were responsible for the development), but his influence did not stop there. He helped commercialize packet switching technology through the company Telenet, and spent part of his post-telecommunications career with a view to improving the quality of internet networks. His companies Caspian Networks (since defunct) and Anagran have played around increasing the quality of service for technologies such as video streaming. You may not have known Roberts, but his influence can feel over the internet this day.