The position of Postmaster General went to John Wanamaker.

VOA: special.2010.05.27

And this, aptly enough, is a consumer reaction that John Wanamaker would have expected all along.

ECONOMIST: Internet advertising

The old John Wanamaker adage about not knowing which half of your advertising works has reached the point where most advertisers roll their eyes at the thought of it.

FORBES: Advertising Means Nothing If You Don't Have Predictability