· Fellow, Stanford University, Human Centered AI Institute2022–
· Consultant (2002-2003), Google2002–
· Consultant (1992-93), Interval Research1992–
· Consultant (1987-1996), Action Technologies, Inc.1987–
· Professor (1973-present), Stanford University, Computer Science Department1973–
· Consultant (1972-1983), Xerox Palo Alto Research Center1972–