But in Philadelphia, where he has lived since 1945, and where he built one of the region's largest, most successful businesses (Vanguard has 12,000 employees and oversees nearly $1.2 trillion in assets), and where he helped foster the National Constitution Center, serving as its chairman for nearly eight years, Bogle is less known than, say, Bill Giles of the Phillies or Brian Roberts of Comcast. No doubt many Philadelphians would be surprised to learn that in 1999 Fortune magazine named Bogle one of the investment industry's four giants of the 20th century, and that in 2004 Time magazine included him...