Ximena Hartsock is a former teacher, school principal, and assistant superintendent of instruction in Washington, D.C. In 2007, along with Michelle Rhee, she helped lead the reform effort of D.C. public schools, and was later appointed to the Executive Cabinet of Mayor Adrian Fenty. In 2010, she helped found the National Education Reform group Studentsfirst, which advocates for education policies. She can be reached at [email protected].