@davidyin0711,
Paganelli-Bull Professor of Economics at New York University is a titled position. It could be a titled position named after (an honorarium) a former expert in the field. It could be named after a person or persons who donated a large amount of money to the school.
It looks like in this situation, its the latter. There are at least a couple more Paganelli-Bull titled positions in the business school:
Thomas F. Cooley is the Paganelli‐Bull Professor of
Economics;
Durairaj Maheswaran is Paganelli Bull Professor of
Marketing;
Each with its own separate niche. As for exactly who Paganelli-Bull is/are, I can't find any particulars.