The main issue most quants have with communication is they speak their own language – that almost nobody else in the world outside of their profession understands. That becomes a problem when these brilliant folks who are all about the data have to communicate with the outside world.
Not only is Stephan a card-carrying and experienced actuary, he is also an accomplished writer and communicator. He speaks the language of data, metrics, and technical jargon and knows how to translate that into the language that everyone else needs to be able to understand what that information means.