Amazon.com CTO

It seems that all CTO's are asking a similar question: How do you define what CTO's do? Who is doing it well? A recent posting by Werner Vogels, the CTO of Amazon.com, followed this same line of inquiry (see link below).

It seems that everyone wants to define the CEO, CIO, and CFO. But the CTO can just run his own show and perhaps someone will let him or her know when they have made a mess of things - or perhaps not.

Role of the CTO