Putt's first law and its corollary

First Law

Technology is dominated by two types of people: 
those who understand what they do not manage, 
and those who manage what they do not understand.

Corollary

Every technical hierarchy, 
in time, 
developes a competence inversion

Borrowed from "Put's Law and the Successful Technocrat" and as quoted in April 2006 IEEE Spectrum