Dr. Zweig has been a numismatist for several decades specializing in Early American Coppers and 20th century coinage. He has been cited in issues of Numismatic News. As a Radiologist, Dr. Zweig is uniquely qualified in coin grading accuracy which is a major determinant of coin value. In his appraisals, only the most up to date references are used along with vast experience.
He is a member of the following numismatic organizations:
American Numismatic Association #1156805
Michigan State Numismatic Society #10899
Central States Numismatic Society #R12266
Early American Coppers #3695