Peggy Olson has succeeded, professionally, in a man's world.
She's a junior copywriter at Sterling Cooper and has shown little remorse for the child she never cared for; her family takes care of the son she had with Pete.
Peggy hails from Brooklyn and is sort of Don's protege. He woos her into his new company at the conclusion of season three.
You'll have to believe me that I'll forget this. I don't want you treating me badly because I remind you of it.Peggy
Eugene: Hey Brooklyn, come home with me.
Peggy Olson: Nuh-uh.
Eugene: Why not? I live alone.
Peggy Olson: Why should I?
Eugene: [questioning] Because I like you, and we're having a good time, and I'm a good kisser and you know you want to.
Peggy Olson: Eugene, I'm in the persuasion business, and frankly I'm disappointed by your presentation.