Jeremy Bentham was an English philosopher and political radical. He is know for his moral philosophy in particular utilitarianism. Utilitarianism evaluates actions based upon their consequences.
His moral and political philosophy is based off three things.
1) the greatest happiness principle
2) universal egoism
3) the artificial identification of one's interests with those of others.
The greatest happiness principle, is what is morally obligatory is that which produces the greatest amount of happiness for the greatest number of people, happiness being determined by reference to the presence of pleasure and the absence of pain. The absence of pain is what he referred to as happiness.
He argued that the hedonistic value of any human action is easily calculated by considering how intensely its pleasure is felt, how long that pleasure lasts, how certainly and how quickly it follows upon the performance of the action, and how likely it is to produce collateral benefits and avoid collateral harms. Taking such matters into account, we arrive at a net value of each action for any human being affected by it.
His moral philosophy points out how the primary motivators for humans are pain and pleasure. Bentham does say that humans would seek the general happiness of all because somehow the happiness of others are inter winded with their happiness and serve as boundaries. States that you can measure happiness in terms of people, and how everyone is counted as one which is able to also bring in equality.
source: http://www.iep.utm.edu/bentham/#H4
http://www.philosophypages.com/hy/5q.htm