NuStar Energy

“It’s a tone set from the top down,” says DJ Rodriguez, a lead compliance auditor, of NuStar’s culture of giving back. Roughly 200 employees at this oil and gas company spent a day helping to transform the campus of Roy Maas Youth Alternatives, a nonprofit that serves children in crisis. Among them were the company’s CEO, who moved mulch with a tractor, and its chairman, who helped to paint a school building. Read the Great Place to Work review here.