The W.B. in W.B. Mason stands for William Betts. William Betts Mason founded the business in 1898 in Brockton, MA. Mason was born in Auckland, New Zealand and immigrated to the United States as a youth.
What began as a rubber stamp company in 1898 is now one of the largest privately-owned office products dealers in the United States with yearly sales approaching $1 billion. W.B. Mason is believed to be the model for the fictional Dunder Mifflin paper company on NBC's The Office.
W.B. Mason is the "Official Office Supplier" of several major sports teams, including the MLB's Baltimore Orioles, Boston Red Sox, Philadelphia Phillies, New York Yankees, New York Mets, and the NHL's Boston Bruins.