Casting Directors are paid by the producer
and usually work on a set fee basis. Their goal is to find
the appropriate actor for your needs. Talent Agents are paid
by the talent themselves and usually work on a commission
basis. Their goal is to find work for their actors.
Directors have many more resources when looking for suitable talent,
including relationships with talent agents. These relationships give
casting directors access to talent that a producer would not be able
to audition by calling a talent agent directly or by advertising. And
they can often negotiate more favorable rates for talent than a producer
could or than a Talent Agent would be willing to negotiate.