Chandra and XMM-Newton Observations of the Highest Redshift Quasars:   X-rays from the Dawn of the Modern Universe
  We review X-ray studies of the highest redshift (z > 4) quasars, focusing on recent advances enabled largely by the capabilities of Chandra and XMM-Newton. Included are discussions of basic X-ray population studies, X-ray spectroscopy, high-redshift AGN in X-ray surveys, and future prospects. 
W.N. Brandt, C. Vignali (PSU), X. Fan (IAS), S. Kaspi (Tel Aviv), D.P.   Schneider (PSU)