· Director, MIT CSAIL, MIT CSAIL2011–
· Professor of Electrical Engineering and Computer Science, MIT CSAIL2011–
· Researcher and Professor (2011-present), MIT CSAIL2011–
· Director of the Lab for Computer Science and CSAIL, MIT CSAIL2001–
· Director of the Lab for Computer Science (LCS), MIT Laboratory for Computer Science2001–2011
· Director / Leadership roles, MIT Laboratory for Computer Science / CSAIL2001–
· Head of Spoken Language Systems Group, Massachusetts Institute of Technology (MIT)1989–
· Researcher and Principal Investigator, Learning and Intelligent Systems Group, Massachusetts Institute of Technology (MIT)1989–2001
· Head of Spoken Language Systems Group (1989-2001), MIT CSAIL1989–
· Director, MIT Spoken Language Systems Group1989–
· Head of the Group, MIT Spoken Language Systems Group1989–
· Professor of Electrical Engineering and Computer Science, MIT
· Co-Director and Director (dates not specified), MIT CSAIL
· Co-Director and Director of CSAIL, MIT CSAIL
· Director, MIT CSAIL
· Member of the Theory of Distributed Systems Group, MIT EECS
· Director (tenure not specified), MIT Laboratory for Computer Science