Every summer, people head to the grocery store in droves to pick up cartons of cold, creamy ice cream. It's a great way to stay cool. But shoppers will go elsewhere if the frozen dairy treat is crusted with yucky ice crystals--the result of freezing, thawing and refreezing. No one knows this better than Chris Hjelm, CIO at Kroger, a $108 billion supermarket chain and a 2015 CIO 100 award winner.