sentences:  Matlock has held visiting appointments at the Woodrow Wilson School of Public and International Affairs at Princeton University, at Hamilton College, at the Columbia University School of International and Public Affairs and at Mount Holyoke College.He has been awarded honorary doctorates by Greensboro College, Albright College and Connecticut College.Matlock completed his dissertation and received his Ph.D. from the Columbia University Graduate School of Arts and Sciences at their commencement ceremony on May 22, 2013.