Title:  The Demography of Massive Black Holes 



Scott Tremaine
Princeton University Observatory 



Abstract:

If accretion onto massive black holes is the power source for quasars,
then many nearby galaxies should contain "dead quasars"-- massive black
holes at their centers that do not shine because they are starved for
fuel.  I will review the accumulating evidence that almost all nearby
galaxies contain black holes of 10^6 - 10^9 solar masses at their
centers. I will also discuss how the local distribution of black-hole
masses is related to the history of the quasar population.