In the last few years , he has often been on the Chronicle of Philanthropy 's list of top U.S. philanthropists .
Possibly as a move against such accusations , Pickens has donated over $700 million to philanthropic causes .
In the last few years , Pickens has often been on the Chronicle of Philanthropy 's list of top U.S. philanthropists .
Possibly as a move against such accusations , Pickens has donated over $700 million to philanthropic causes .