A three-year stint in the corporate world taught Raymond Lauk, now superintendent of Cook County School District 130 in Illinois, to focus on results. Now that he's once again leading a school district, Lauk has implemented formative assessments and a common-core-aligned curriculum. "When we do things for the benefit of kids, sometimes it means saying 'no' to the adults. We have to do what is best for students. It's just not negotiable," Lauk said.