David Mamet is an American playwright, screenwriter, and director. His plays often explore the dynamics of power and authority between characters. Two of his most famous plays are 'Oleanna' and 'American Buffalo'. 'Oleanna' is a two-person play about the power struggle between a college professor and one of his female students. 'American Buffalo' is a three-person play about a group of small-time crooks who plan to rob a man's coin collection. Both plays have been adapted into films and continue to be performed around the world.