Where do I start? He brought the MacDac style of building airplanes to Boeing - a system that worked
so well that it basically put MacDac out of the business of building commercial aircraft
It was Stonecypher who masterminded the whole outsourcing thing that made the 787 such a mess. He and Condit were the ones that decided that Boeing needed to focus on making great amounts of money and 'stockholder value' - not on building great airplanes.
The short answer is that pretty much everything that is wrong with Boeing today can be traced back to Phil Condit and Harry Stonecypher