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Article Contents

ABSTRACT

1.INTRODUCTION AND BACKGROUND

2.OBSERVATIONAL TECHNIQUES, SELECTION EFFECTS, AND SURVEYS

2.1.Techniques for Finding Quasars and AGNs

3.EVOLUTION OF THE AGN POPULATION

3.1.Results through 1995

3.2.Recent Large Optical Surveys

3.3.Spectral Evolution

3.4.Evolution of Radio Sources

4.ESTIMATING BLACK HOLE MASSES

5.THEORETICAL CONSIDERATIONS: HOW THE MASSES GROW

6.CURRENT RESEARCH PROGRAMS

6.1.Optical/Infrared Surveys

6.2.Evolution of X-ray Sources

7.NEXT STEPS

REFERENCES