It's easy to find a member of the Professional Numismatists Guild (PNG), a nonprofit organization composed of the world's top rare coin dealers, paper money and precious metals dealers and numismatic experts.
The Professional Numismatists Guild, founded in 1955, had its inception in 1950 with Abe Kosoff. At the time, Kosoff was in partnership with Abner Kreisberg in Numismatic Gallery, a firm that was well known for handling major collections and rarities.