That is Hugo Blick, the same guy who’s the producer, writer, and director of The Shadow Line.
It says so in this Guardian piece that has a major spoiler in the first paragraph (so I suggest you skip it until you’ve seen the first episode): Hugo Blick on how he wrote The Shadow Line.
Previously here:
TV: The Shadow Line, Episode Two
TV: The Shadow Line, Episode One
Yep. All teeth.