I want to know the answer to the following question:
Which Yale president assisted with New Haven's revitalization efforts?
All the background I'm provided with is that "Yale has a complicated relationship with its home city; for example, thousands of students volunteer every year in a myriad of community organizations, but city officials, who decry Yale's exemption from local property taxes, have long pressed the university to do more to help.". Is that enough to answer the question?