The practices of hypnopaedia, neo-Pavlovian conditioning, and social manipulation are essential, effective, and enduring methods of social control in Huxley's Brave New World. These concepts have been employed, whether intentionally or unintentionally, to achieve a similar end in modern American culture.
Very good thesi; however, (and this is from an English Graduate Student talking) "These concepts have been employed" is passive voice. Who is employing these concepts? They need to be the subject of the sentance.
Excellant comma use to!

i am such a nerd