SHQs and PDs: Does the credit belong to the US Mint, Congress or Numismatists?

I was reading up on the Presidential Dollars and ran across an interesting quote from Michael Castle, US Rep R-Delaware. Michael Castle is the chief sponsor of legislation for both the SHQ type coins and the PD type coins. In a CoinValues special he's quoted as saying:
<< <i>"It was the numismatists who came up with this [SHQ] idea - borrowing it from Canada. They are the ones who approached me. If it weren't for them, this would never have happened," Castle said. He notes that the State quarters success also "changed the mind-set at Treasury. They were more skeptical than I was."
Citing Canada's successful program celebrating 125 years of confederation with designs on circulating quarters honoring each of its provinces and territories, U.S. collectors advocated honoring each of the 50 states, in the order they entered the union. >>
Does anyone know who are the numismatists that introduced and convinced Castle/Congress to pursue the SHQ idea?
Who should get credit for the SHQs (and by extension, the PDs): the Mint, Treasury, Congress or Numismatists?
<< <i>"It was the numismatists who came up with this [SHQ] idea - borrowing it from Canada. They are the ones who approached me. If it weren't for them, this would never have happened," Castle said. He notes that the State quarters success also "changed the mind-set at Treasury. They were more skeptical than I was."
Citing Canada's successful program celebrating 125 years of confederation with designs on circulating quarters honoring each of its provinces and territories, U.S. collectors advocated honoring each of the 50 states, in the order they entered the union. >>
Does anyone know who are the numismatists that introduced and convinced Castle/Congress to pursue the SHQ idea?
Who should get credit for the SHQs (and by extension, the PDs): the Mint, Treasury, Congress or Numismatists?
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