Westwood Arms I believe I read that he did hang out with Mark Hofmann. In case anyone who might read this is not familiar with Mark - he is perhaps the best Numismatic Forger of the 20th century. He takes credit for the 1959
Lincoln Cent with the Wheat reverse that was actually authenticated by the mint as genuine.
He also made Mormon Gold coins that were sold as genuine along with many other forged autographs and letters.
The BEST way to learn about forgery is to learn from actual forgers. I say that from personal experience as those who know me are aware.
Forgers, in particular successful ones provide many clues to the "theory and philosophy" of counterfeiting that helps to assess what are likely targets for circulating forgeries and what are not.