Barney is a loveable, drunken oaf. He spends every waking hour at Moe's Tavern. He in fact is he was so addicted to alchol that he lived right above Moe's tavern.
His most distinguished accomplishment is probably starting the Plow King business, a direct competitor of Homer Simpson's Mr. Plow business. Barney had a slight edge, due to his larger plow and his commercials featuring Linda Ronstadt.