He was pretty senior for his role, but really I have no idea whether he was representative of the wider company culture.

We had a buggy client release during the rollout which consumed all the CPU in one of our test environments (something he assured us could never happen), and he calmed down a bit after that. Prior to that though he was doing stuff like finding our CISO on LinkedIn to let him know how worried he was about our rollout pace, and that without CS protection a major breach could be imminent.