The assignment regards international relations theory, using Kenneth Waltz's Structural Realism after the Cold War and Andrew Moravcsik's Taking Preferences Seriously: A Liberal Theory of International Politics. Maybe the evidence lies within the text, or maybe you have to deliver further and do a little detective work on the particulars of the writers' intellectual and professional biographies. Don't simply tell me that one is a Realist and the other a Liberal.
The professor specifically mentioned to pay attention at their personal lives or any events that might affect their point of view of Realism and Liberalism.
The idea doesnt need to be right, just need to show him why you think of that and the related statement of proofs.
Article 1- Taking Preferences Seriously: A Liberal Theory of International Politics by Andrew Moravcsik
Article 2 - Structural Realism after the Cold War by Kenneth N. Waltz