Unless you avoid pork for religious reasons, you've probably eaten pork products from Smithfield Foods: the bacon or sausage in a McDonald's Egg McMuffin, Armour-Eckrich bologna or ham, pork from Bob Evans or Jimmy Dean's, an Esskay hot dog at Baltimore's Camden Yards, and quite likely your Easter ham.

Smithfield is a pork giant. It has 49 factories, 500 or so hog farms, 48,000 employees and about $11 billion in revenues in FY2010. It slaughtered about 27 million animals last year in the U.S. "We're the largest pork producer in the world, by a long shot," says Dennis Treacy, the company's chief sustainability officer.

Yes, Smithfield has a chief sustainability officer -- and that may surprise you if you remember reading horror stories about Smithfield's confined animal feeding operations (CAFO's), its problems managing pig manure, its labor conflicts or animal welfare issues in places like The New York Times and Rolling Stone. The company was featured -- not in a flattering way -- in the movie Food Inc. and sued by Robert F. Kennedy Jr. and the Waterkeeper Alliance.

Treacy had problems with Smithfield, too, before joining the company. In fact, Treacy, who was the director of the Department of Environmental Quality (DEQ) for the state of Virginia from 1998 to 2002 under Republican Gov. Jim Gilmore, once sued Smithfield for polluting the state's waters. (You can look it up here.) In 1997, Smithfield was fined $12 million, one of the largest fines at the time, for violations of the federal Clean Water Act.

Now, though, Treacy says Smithfield has cleaned up not just the water but its own act. He's been with the company for nine years, and says he was hired to make the company more sustainable and improve its reputation. "We have slowly but surely built a sustainability program," he says. "It's the right thing to do, and everybody wants to work for a company that is respected."

I met Dennis earlier this week in Washington. He seems like a good guy, and he's spent his career on environmental issues -- he studied fisheries and wildlife at Virginia Tech, got a law degree from Lewis and Clark in Oregon, which is a top environmental law school, and he lives on a small farm near Richmond where he and his wife raise chickens and rabbits.