Bill Kling is the man behind Minnesota Public Radio, the broadcasting juggernaut that is, by its own admission, hoping to change the landscape of public broadcasting across the country. Once a mild-mannered regional network best known for producing A Prairie Home Companion, Kling’s MPR has become the 800-lb. gorilla of the industry, acquiring competing stations like a for-profit company would, and expanding its reach well outside the Upper Midwest. Whether these are positive or negative developments in the genteel world of pubic radio depends entirely on whom you ask.