[ghaff]

I've seen both. A CTO office that also leads engineering--typically via a direct report to the CTO--and an organization where the CTO is largely an external evangelist (typically with a small staff) while engineering is a separate organization--though hopefully aligned. The view here where CTO is also the head of day-to-day engineering operations and technical vision is more of a small company/startup thing. The two are often separated to at least some degree at larger operations.