The best replacement for greenspan is bernanke.

The best alternatives to greenspan are rated as following:
★★★★★  bernanke
★★  shepard
★★  ladd
★★  aba
★  dershowitz
★  arkin
★  ben bernanke
★  volcker
★  waxman
  buffett
  turing

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Speaking about greenspan, one probably shouldn't forget about notably rare exceptions.

Other search terms related to greenspan and their ratings are:
★★★★★ notably rare exceptions
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