High school dropout who took an unassuming Wisconsin construction business and turned it into a multibillion-dollar company.
He worked for several companies after quitting school at grade 11, eventually opening up his own roofing business and dabbling in real estate.
He built up his roofing business to a multistate operation, then quit the company to open his ABC Supply wholesalers.
His wife Diane helped him run his businesses. The two had seven children.