David William Grainger was born in United States. David Grainger is the largest individual stockholder of W.W. Grainger, the industrial supply company founded by his father William W. Grainger in Chicago in 1927. David joined the company in 1952 and became a director of it the next year. He served in that capacity until 2007. After he left, a former sales manager accused the company of overbilling the US government in supply contracts. The company settled with the government out of court for $6 million, and admitted no wrongdoing. In February 2013, W.W. Grainger was reported, alongside General Mills, to be a possible buy-up target for Warren Buffet's cash-rich Berkshire Hathaway. The company's stock was recession-proof leading up to and during the financial crisis -- and the value of W.W. Grainger stock has nearly tripled in the past five years.