A barrel Maker
Cooper - n. - a person whose work is making or repairing barrels and casks (Webster" New World Dictionary). Cooperage, from same source indicates it is the workshop of or work done by a Cooper.
Today, the profession of the cooper is synonymous with the wine and spirits industry where the cooper assembles casks and operates machinery that builds barrels.
In much the same way that the profession of smithing has produced the popular English surname Smith and the German name Schmidt, the trade of cooperage has also given the English name COOPER