In general, people with one foot in programming and one foot very publicly in the world of ideas for the public good:
Doug Engelbart (and thus Bill English, for stretching technology through ideas beyond the vocabulary of the time)
Everybody associated with the Near Future Laboratory (for their relentless combination of user experience, urbanism, tech device development, and culture theory)
John Langford (machine learning, for a commitment to both theory and performance, and for constant attention to the machine learning community itself)
Paul Graham (for the commitment to speedy and wanton development, and sticking to what he knows is good even through lean times)
Lee Felsenstein (for the dedication to public computing)
Adam Greenfield (for a commitment to the convivial experience of public life)
Jimmy Wales
Dan Bricklin (for both the spreadsheet and his work on social infrastructural computing)
Clay Shirky (for carefully thinking through the social problems of archiving)
Robert Lefkowitz (for connecting his work to deeper history, in particular the history of literacy)