  This article reviews and discusses 1) the discovery and early work on the
evolution of quasars and AGNs, 2) the different techniques used to find quasars
and their suitability for evolutionary studies, 3) the current status of our
knowledge of AGN evolution for 0 < z < 6, 4) the new results and questions that
deep radio and X-ray surveys are producing for the subject, 5) the relation of
AGNs to massive black holes being found in local galaxies and what they tell us
about both galaxy and AGN evolution, and 6) current research problems and
future directions in quasar and AGN evolution.
