David Mayfield is a Vice President at Heritage Auctions. David started collecting coins at the age of nine and has been trading at coin shows since he was ten years old. David became a full time coin dealer in the early 80's, and has been a regular on the national and international coin show circuit ever since. David came to work at Heritage Auctions in 1992, and since has had the pleasure of assisting thousands of collectors in building their collections and ultimately in helping them bring their collectible legacy to market. David oversees Heritage Auction's numismatic consignment division, and works with collectors and Consignment Directors across all of Heritage Auction's collectible categories.

Dustin Johnston joined the Heritage team in 1998 and has been active in nearly every aspect of the business. He was born and raised in Tucson, where he also attended the University of Arizona. Prior to joining Heritage, he won a number of literary and exhibiting awards from the ANA. Dustin also served as an Exhibit Judge and Numismatic Theater Speaker for the ANA. He oversees the management of the Currency division including consignment acquisitions, purchasing, cataloging, and inventory management. He is a member of the PNG, ANA, IBNS, and SPMC. Currently, he serves as Vice President for the Professional Currency Dealers Association, and a board member for the Professional Numismatists Guild and Anti-Counterfeiting Educational Foundation. Away from work, he enjoys married life, his two young kids, and WWI research related to the 364th Infantry.

Sarah Miller is Director of Numismatics at Heritage’s New York office and brings a lifelong passion for U.S. Coins. A student of numismatics since age 11, she first fell in love with U.S. coins and the history behind them while attending her first coin show. This led to a job in rare coins throughout high school and college, where she graduated Summa Cum Laude from North Central College in Naperville, Ill., with a degree in Finance and Economics. She amassed an impressive list of accomplishments during her studies. Sarah assists Heritage clients with their rare coin collections on a daily basis in addition to being a regular contributor to the Heritage Blog. She has appeared as a numismatic expert on CNN and is a current member of the American Numismatic Association and New York Numismatic Club. She also is a licensed Auctioneer in Texas, Florida, and New York City. In her spare time, she enjoys travel, taking ballet classes, knitting, and baking.  

Jacco is conversant in English, French, Dutch/Flemish and German.

Honored as the American Numismatic Association's Numismatist of the Year for 2020, Borckardt is currently in his 16th year with Heritage, and his 40th year a full-time professional numismatist. During that time, he has handled many of the greatest American coins, including 80 of the top 100 U.S. coins. Borckardt is an expert in the field of early American colonial and copper coins, dating back to 1652. He is well known as a cataloger and author on various topics and has won several numismatic literary awards, including the Numismatic Literary Guild's Clemy Award. 

After graduating from the University of Pennsylvania, Marc joined one of the two firms that later merged in late 1982 to form Heritage. He is has been with the company without interruption since joining in August, 1975. He founded and oversees the operations of the Heritage Overseas offices, which are now in France (since 1979), Germany (since 1979), Switzerland (since 1984), and the Netherlands (since 1990). The Heritage offices in France, Switzerland and the Netherlands are all run by natives of those countries, coordinating in their own languages through Marc at the German office with the Heritage world headquarters in Dallas. The European offices, under Marc's supervision, in turn offer Heritage services to collectors, consignors and estate executors in their own countries and in their own languages, as well as to banks and Central Banks around Europe and the world.

Mark has been an active and important presence in the rare coin industry on a full time basis, since 1979. He has worked for Steve Ivy Rare Coins, Heritage Rare Coin Galleries (an early incarnation of Heritage Auctions), David Hall, Mark Salzberg, at NGC as a grader, Pinnacle Rarities and as owner of his own numismatic business, Mark Feld Rare Coins.

An avid coin collector from an early age, Mark has been quoted as saying “Numismatics must run in my blood, literally. Numismatic pioneer B. Max Mehl was my grandmother's uncle, and I have always been very proud and respectful of that special connection.” And Mark has backed up those words in his dealings with collectors, as well as dealers, over a period spanning more than thirty years. He has been widely recognized as an outstanding source of numismatic information and collecting advice to countless collectors - a  true collector’s advocate.