Don Draper is the Creative Director at the Sterling Cooper advertising agency. He hasn't always held that job, of course, or even always had that identity.
Draper fought in World War II and assumed the identity of a fallen fellow soldier once he returned to the States. Therefore, the world of advertising is a perfect fit: Don's entire life is selling a version of himself to those around him.
He lives in Ossining, New York, with his wife Betty and their two children, Sally and Bobby. However, at the end of season three, Betty left Don after she learned of his past as Dick Whitman.
Don: You're not just smooth. You're Wilkinson smooth.
Nostalgia - it's delicate, but potent. Teddy told me that in Greek, "nostalgia" literally means "the pain from an old wound." It's a twinge in your heart far more powerful than memory alone. This device isn't a spaceship, it's a time machine. It goes backwards, and forwards... it takes us to a place where we ache to go again. It's not called the wheel, it's called the carousel. It let's us travel the way a child travels - around and around, and back home again, to a place where we know are loved.Don Draper