No, he was the (effectively) "Chief" Test Pilot and lead pilot engineer on the project. There was no single "brain" behind the A320 - it was a long-running collaborative project, as I said above.
[EDIT : Corrected re: peekay4's reply. While GC was not officially the Chief Test Pilot by title, he was the test pilot who oversaw the majority of the practical work, as well as the lead pilot engineer who provided the feedback on the systems. ]
Last edited by DozyWannabe; 29th May 2015 at 22:46.