Like many of today’s numismatic experts, Bill started in the hobby at a very early age. As a paperboy in his Philadelphia neighborhood, he would occasionally get paid with old silver dollars, Buffalo nickels, and other interesting coins. Since there were many coin shops in downtown Philadelphia, he could take the subway downtown, get advice, and buy and sell from well-known dealers in the area. One dealer allowed him to sit on the floor and read paper printouts of daily transactions from the old “teletype” machine to see what was going on in the market. He also gained experience by delivering purchases to other dealers in the city.

His superb reputation, strong customer relationships, and numismatic expertise have kept Bill at the top of the field throughout his career. He was the Chief Numismatist at Superior Galleries for four years, a grader at Professional Coin Grading Service (PCGS) for two years, and a Grader/Finalizer at Numismatic Guaranty Corporation (NGC) for nine years. Bill has been recognized as an Expert Witness in Federal Court cases on several occasions.

His commitment to the hobby also includes acting as an instructor of Advanced Grading at the summer seminar sessions of the American Numismatic Association (ANA), one of the leading collector organizations. Among Bill’s other passions are car racing and art from the turn of the century.

Andrés brings to Stack’s Bowers Galleries superb numismatic expertise and a focus on Latin America that has long been recognized in the hobby. His passion for numismatics began when he was only four, as his father kept a small safe in the house for his most important keepsakes, including banknotes from his childhood given to him by his grandmother. Andrés was allowed to view and gently handle the notes, and they instantly captured his interest. He and his father then embarked on building a banknote collection together. As the third generation of collectors, Andrés maintains his family’s tradition of collecting banknotes from Colombia, Venezuela, and other Latin American countries, as well as from around the world.

Andrés’ career began with an Industrial and Systems Engineering degree from Florida International University (USA), followed by a master’s degree in economics and international trade from the University of Shanghai (People's Republic of China). As a numismatist, his expertise and talents as a researcher, lecturer, advisor, and author have been highly sought after by a variety of organizations.

Andrés was the president of the Numismatic Foundation of Colombia (NUMISCOL) for more than five years and served as a Numismatic Advisor for the Colombian Central Bank and Curator for the Casa de la Moneda de Bogotá Museum. He also served as president of the Third International Convention of Historians and Numismatists Cartagena 2021, considered one of the most important numismatic events in Latin America to date. In addition, Andrés has over two years of experience grading banknotes with the world-renowned grading firm, Paper Money Guaranty.

Justin’s interest in numismatics began at the age of eight when his grandmother gifted him his father’s partially filled coin albums, a collection of Morgan and Peace dollars, and a container of coins that had been saved over the course of 40 years. This early experience ignited a lifelong passion for numismatics.

His professional journey began at 16 when he started trading coins. At 19, he gained his first experience working at a numismatic retail establishment, Miami Gold Coins, and since then, he has become a seasoned numismatist through continuous work and dedication to the industry. Over his career, he has operated his own numismatic company and served as Senior Numismatist at a well-known numismatic firm, Pegasus Coin and Jewelry.

He is a long-time member and current life member of both the American Numismatic Association (ANA) and the Florida United Numismatists (FUN), and he is a member of the Professional Numismatists Guild (PNG).

Born and raised in Miami, Justin is a graduate of Gulliver Preparatory School and earned his bachelor’s degree in psychology from the University of Central Florida. He has been an avid collector of Franklin half dollars with Full Bell Lines and has handled tens of thousands of Uncirculated examples.

Hernán Urrutia is a numismatist and entrepreneur with a background in finance. Born in Venezuela, he moved to the United States for his education, graduating from Florida International University (FIU) in Miami in 2006. His passion for coins and banknotes began at a young age when his father introduced him to a Venezuelan banknote—without a serial number or signatures—igniting a lifelong dedication to the field.

Hernán began his numismatic journey in the early 2000s, attending his first major show at the New York International Numismatic Convention (NYINC). Specializing in Latin American coins, he has actively participated in major numismatic events across the United States. While living in Panama, he served as Vice President of the Panama Numismatic Association (ASONUM), playing a key role in organizing events and fostering numismatic interest in the region. Hernán has also been an active member of several prestigious numismatic associations, including NUMISCOL in Colombia, ASONUM in Panama, and the American Numismatic Association (ANA) in the United States.

In addition to his numismatic talents, Hernán has a strong foundation in finance and entrepreneurship. Before joining Stack’s Bowers Galleries, he successfully owned and managed multiple businesses, solidifying his expertise in business development and investment strategies. Today, he continues to play a key role in the numismatic community, leveraging his knowledge of Latin American coinage to assist collectors and investors worldwide.