High Quality Content by WIKIPEDIA articles! Jack Bonnell Dennis is an American electrical engineer and a computer scientist. Dennis entered the Massachusetts Institute of Technology (MIT) in 1949 as an electrical engineering major; he received his M.S. degree in 1954, and continued doctoral research and received his Sc.D. in 1958. He became a full professor in 1969. He was involved in early work on time-sharing through the PDP-1 which his group owned at MIT; that machine is famous in computer science as the machine on which hacker culture started. He shepherded the MIT Model Railroad Club.