· Professor of Computer Science, Emeritus, MIT CSAIL2026–
· Researcher, MIT Medical Vision Group2025–
· Head, Library Research Group, MIT CSAIL1991–
· Technical Director, MIT Project Athena, MIT CSAIL1984–
· Researcher and contributor to early network software and operating systems, MIT Computer Systems Research Group1983–
· Professor of Computer Science and Engineering, Massachusetts Institute of Technology1976–
· Head, Computer Systems Research Group, MIT CSAIL1975–
· Associate Professor, Massachusetts Institute of Technology1970–
· Co-Head, Computer Systems Research Division, MIT CSAIL1970–
· Assistant Professor, Massachusetts Institute of Technology1966–
· Professor of Computer Science, Emeritus, Massachusetts Institute of Technology1966–
· Researcher, Massachusetts Institute of Technology (MIT) Vision Group1966–
· Faculty Member, Computer Science and Electrical Engineering, MIT1966–
· Faculty Member and Researcher, MIT Department of Electrical Engineering and Computer Science1966–
· Member, MIT Computer Science and Artificial Intelligence Laboratory (CSAIL)1964–
· Researcher/Contributor in Multicore Algorithmics Group, MIT (Massachusetts Institute of Technology)1964–
· Instructor, Massachusetts Institute of Technology1963–
· Teaching Assistant, Massachusetts Institute of Technology1961–
· Undergraduate Research Staff, Massachusetts Institute of Technology1959–