Anyone who has taken a class with Professor Avraham knows he relies heavily on the ex-ante/ex-post distinction. Here is a good article that really fleshes out the philosophical significance of the ex-ante/ex-post distinction. Professor Avraham gave me his take on the distinction recently: "If something is fair ex-ante and unfair ex-post, it is fair, I argue."
This is not the paper Professor Avraham will be discussing at the upcoming meeting, but I found it really eye-opening and it is the reason I invited him to come speak. I'm posting it here in case anyone wants to discuss it.