Input: Relationship: 'be columnist for', Argument/Subject 1: 'anthony lewi', Argument/Subject 2: 'new york time'

Answer: Joining Professor Gewirtz and Center staff in the workshop were American experts on media freedom and tort law , including celebrated New York Times columnist Anthony Lewis , YLS Professor Robert Post , Judge Robert Sweet from the University of Virginia , and Professor Michael Chesterman , Australia 's leading defamation law expert .