Father, Al, founded freight company with one truck 1935, grew rapidly through acquisitions, expanding into interstate shipping. Donald became president of Schneider National 1976, complemented father's eighth-grade education with Wharton M.B.A. Pioneered use of satellite tracking technology, transportation logistics. Today company's fleet includes 14,000 tractors, 40,000 trailers. Sales: $3.4 billion. Continues to expand internationally: growth in China helping offset freight shortcomings in U.S.