Accordingly, von Braun became director of NASA’s Marshall Space Flight Center and the chief architect of the Saturn V launch vehicle, the superbooster that would propel Americans to the Moon. Von Braun also became one of the most prominent spokesmen of space exploration in the United States during the 1950s
I don’t think Warner was ever head of NASA.
This is the best I can find
That’s still a quite high position, so while yes, you’ve got a very good point. His still stands :D