Thread title pretty much speaks for itself!
To those who don't watch American Dad, as something of the show's breakout character...Roger is an extraterrestrial alien who lives in the Smith family's attic where he's hiding out from the CIA. To help alleviate the tedium of being cooped up all day, Roger adopts various "personas", endlessly elaborate alter-ego's of his own creation who all, inexplicably, seem to have their own individual careers and social lives outside of the house.
Personally speaking, my favourite Roger persona has to be Professor Jordan Edelstein by a country mile.