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The current status of our Chandra and XMM-Newton project on high-redshift(z>4) quasars is briefly reviewed. We report the main results obtained in thelast few years for the detected quasars, along with a few (~10%) intriguingcases where no detection has been obtained with Chandra snapshot observations.Comment: 4 pages, to appear in the proceedings of 'Multiwavelength AGN  surveys' (Cozumel, December 8-12 2003), ed. R. Maiolino and R. Mujic

THE Z > 4 QUASAR POPULATION OBSERVED BY CHANDRA AND XMM-NEWTON