A Numismatist is someone who specializes in the study and collection of coins, tokens, and paper money. They are often referred to as a collector of coins due to their interest in the history and value of coins. Numismatists typically have a deep knowledge of the history of coins and currency, and they often use this knowledge to build collections of rare and valuable coins. They may also be involved in the buying and selling of coins, as well as the authentication and grading of coins.