Karp's doctoral thesis, supervised by Karola Brede, was titled "Aggression in der Lebenswelt: Die Erweiterung des Parsonsschen Konzepts der Aggression durch die Beschreibung des Zusammenhangs von Jargon, Aggression und Kultur", which means "Aggression in the life-world: The extension of Parsons' concept of aggression by describing the connection between jargon, aggression, and culture."