The projects described in this paper involved extensive collaboration with Intel colleagues. Special appreciation is owed to designers Stefanie Danhope-Smith, Jason Cassezza and Daria Loi; to social scientists Jay Lundell, and Eric Dishman; and to engineers Farzin Guilak, Terry Dishongh, Brad Needham, Bill Deleeuw, Michael Labhard, Mick Flannigan, and JM Vanthong. Thoughtful reviews were provided by John Sherry, Gina Grumke, Sue Faulkner, and Alex Zafiroglu. In addition, I thank collaborators Richard Sloan and Ethan Gorenstein of Columbia University and Larry Jamner from the University of California at Irvine. The research was supported by the Health Research and Innovation division of Intel's Digital Health Group.