Bowen Marsh

Bowen Marsh is a character in Game of Thrones. He is played by Brian Fortune and debuts in the first season. HBO announced Fortune as playing 'Night's Watch Officer', but according to the actor and other information this is the same role as Bowen Marsh in the books.

Bowen Marsh is the First Steward of the Night's Watch, based at Castle Black. He is in charge of the day-to-day running of the Night's Watch, dealing with issues of supplies, funding and communications.

In the books
In the Song of Ice and Fire novels, Marsh is an important and senior figure in the Watch, reporting directly to Lord Commander Jeor Mormont and is just below him in the command hierarchy of the Watch.