· Adjunct Professor of Computer Science, Columbia University2019–
· CEO, famli.net Communications Inc.2014–2016
· Adjunct Professor in the Faculty of Design, OCAD University2012–2016
· Emeritus Professor of Computer Science, University of Toronto2012–
· Mentor (assisted in spinning out the company), MyVoice Inc.2011–2012
· Director, Technologies for Aging Gracefully Laboratory (TAGlab), University of Toronto2009–2018
· Chairman of the Board, Captual Technologies Inc.2008–2011
· Interim Director, Knowledge Media Design Institute, University of Toronto2008–2009
· Chief Scientist, Knowledge Media Design Institute, University of Toronto1999–2009
· Founder, Expresto Software Corp.1998–2002
· Founding Director, Knowledge Media Design Institute, University of Toronto1996–1998
· Visiting Professor, The Media Laboratory, MIT1993–
· Visiting Professor, Dept. of Computer Science & Faculty of Commerce, University of British Columbia1993–
· Associate Professor (tenured), Department of Computer Science, also Electrical Engineering Dept., University of Toronto1985–1989
· Adjunct Associate Professor, Department of Computer Science, University of Toronto1983–1985
· Chairman of the Board, Human Computing Resources Corporation (HCR)1977–1990
· Founder, Human Computing Resources Corporation (HCR)1976–1984
· Summer Staff Member, Learning Research Group, Xerox Palo Alto Research Center1974–
· Director or Co-Director, Dynamic Graphics Project, Computer Systems Research Institute, University of Toronto1972–1981
· Visiting Assistant Professor, Department of Computer Science, University of Maryland1971–1972
· PhD in Computer Science, MIT1969–
· Commissioned Officer, Division of Computer Research and Technology, National Institutes of Health, U.S. Public Health Service1969–1971
· Ph.D. Thesis Student, Projects MAC and Lincoln Laboratory, MIT1966–1969
· Summer Staff Member, Computer Graphics Section, Lincoln Laboratory, MIT1966–1967
· M.Sc. in Electrical Engineering, MIT1964–
· B.Sc. in Physics, MIT1963–
· B.Sc. Thesis Student, Communications Biophysics Laboratory, MIT1963–
· M.Sc. Thesis Student, Cognitive Information Processing Group, MIT1963–1964
· Research Assistant, Brookhaven National Laboratory1962–
· Technician, Communications Biophysics Laboratory, MIT1961–1962
· Research Assistant, Pittsburgh Plate Glass Research Labs1961–
· Research Assistant, Koppers Company Research Labs1960–
· Senior Visiting Scholar, Human Interface Group, Adv. Tech. Div., Apple Computer