Executive Vice President of International Numismatics
1-800-USCOINS (872-6467) x1661
Languages Spoken: Portuguese, Spanish
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Cristiano Bierrenbach started trading coins in his native Rio de
Janeiro at the age of seven before founding his own successful numismatic
business. In 1996, he established one of the first numismatic shops on eBay and
later became the youngest Technical Director of the Brazilian Numismatic
Society at the age of 30. Cristiano joined Heritage and moved to the United
States in 2007. Under his leadership, Heritage World and Ancient Coins auction
sales grew steadily from $12.8 million in that year to $41.5 million in 2011,
the year he became a partner. Cristiano developed the market for Heritage
online-only automated auction venues, which today feature more than sixty
events per year. In World Coins alone, these auctions exceed $12 million
annually. Since 2015, Cristiano has been at the forefront of Heritage’s
international expansion into Europe and Asia, and will continue to expand the
company’s international footprint in the future.
Roxana Uskali, the Director of Numismatics for Heritage
Auctions’ Chicago office, started collecting coins like many of you — as a
youngster who frequented a local coin and stamp shop in her neighborhood. She
went on to graduate cum laude from Loyola University Chicago, receiving degrees
in world history, theology, and piano performance before pairing her diverse
academic background and her love of traveling into a career in professional
numismatics. Roxana spent nine years working as the principal world coin
numismatist for the prestigious Chicago firm Harlan J. Berk, Ltd., and more
recently her own company, KRCoins. Over the last several years, she has helped
catalog Heritage’s world coin auctions while also frequently attending major
coin shows around the U.S. and abroad. In addition to being a member of the
ANA, the IBNS, and the CSNS, Roxana also produces coin-related videos called Coincasts.
Warren Tucker has been a full-time coin dealer since 1964. In 1968, he joined Jack Boozer and Doug Weaver in business in Waco, Texas, where he first met Steve Ivy. Warren later moved back to Georgia, where he became a partner with John Hamrick at WorldWide Coin Investments of Atlanta. During the 1970s, Warren began more extensive travel throughout Europe and Asia to buy coins. In 1979, he first joined forces with Steve Ivy, opening an office in Atlanta. Associations with Richard Nelson and Ronald J. Gillio followed thereafter.
Kenneth Yung joined Heritage Auctions as Director of Asian
Operations after building a career in numismatics as one of the most active
dealers in the Hong Kong and China markets. In addition to accepting
consignments for upcoming Heritage auctions, he will be responsible for all
Hong Kong office operations. Kenneth began to develop a strong interest in
collecting older items as a child, which eventually led to collecting coins and
banknotes during his high school years, and owning a retail business in Hong
Kong during the 1990’s. He has been a full-time dealer since 2002 and PCGS, NGC
& PMG authorized dealer since 2012. A committee member of the Hong Kong
Numismatic Society and Vice Chairman of the Hong Kong Stamp and Coin Dealer
Association, Kenneth is the organizer of the Hong Kong International Numismatic
Fair (HKINF), which is held each June and December.
Zach received a BBA in Finance from the University of Wisconsin-Whitewater in 1992. Having worked primarily in the Information Systems field as a network admin or project manager for various firms since graduation, he left the industry to open his own coin dealer business full-time in 2003. Self-taught and specializing in ancient coins, Zach continued to run the business while participating extensively in on-line forums, developing a reputation for meticulous cataloging and research, leading to a position as co-writer for one of the columns in the Celator Magazine. There he received an award in 2005 for "Best Column" from the Numismatic Literary Guild for "The Internet Connection". In 2013, he accepted the position of customer service manager for an on-line website for coin dealers and remained for 4-1/2 years until joining the world and ancient coin department at Heritage. Bringing his enthusiasm for cataloging, Zach greatly enjoys preparing the popular, and growing, weekly internet sessions, as well as the signature auctions, to assist collectors better understand the complex and beautiful arena of ancient numismatics.
Director of European Operations
1-800-USCOINS (872-6467) Page
Languages Spoken: Dutch, English, French, German, Italian, Russian, Spanish, Swedish
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Marc Emory was born in northern Virginia, where he grew up as the son of a Washington correspondent of a newspaper in Upstate New York. A child of the Washington political scene, he was visiting the White House at age 13, and Capitol Hill many times before that. Like so many children of Washington, he attended the Sidwell Friends School. He than was accepted for the Schoolyear Abroad program in Spain, then sponsored by the two Phillips Academies (Exeter, NH and Andover, MA). After the year in Barcelona, he went on to graduate from Andover (1970), and four years later graduated cum laude from the University of Pennsylvania (1974), with a degree in Spanish. He always had an interest in languages, and while at Penn got his introduction to German and Swedish, in addition to continuing his studies in Spanish and Russian from high school. In addition to those four languages plus Catalan, a byproduct of his year in Barcelona, he has since learned French, Italian and Dutch.
Always interested in collectibles, he was impressed from early childhood by the Smithsonian collections of both coins and minerals, which were within walking distance of his father's office at the National Press Building at 14th and F streets in Washington, D.C. He maintains an extensive collection of minerals at his German home, near the Rheinland city of Dusseldorf, which he shares with his wife of 25 years. His wife, Elisabeth, is a German native, and they speak German at home. Their two bilingual daughters currently attend universities in the United States, after secondary school education in Germany. Marc also has a collection of U.S. coins and an assortment of guitars hand-crafted by legendary luthier Bozo Podunavac. A musician by hobby, he has made recordings and done solo concert tours in his spare time, a commodity which he finds in all too short supply of late.
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.
Nicholas Mathioudakis has been collecting coins since the age of thirteen. Having lived in Saudi Arabia, he would spend a lot of time roaming the souks in search of hidden treasures where he also bought his first ancient Greek coin. His drive and passion for numismatics led him to take up a full time position at Morton and Eden (formerly associated with Sotheby’s) where he catalogued ancient coins and paper money. Mathioudakis’ areas of expertise include ancient coins, paper money, particularly of the Middle East, European medieval, Islamic and Modern coins.
A coin collector and enthusiast from an early age, Cale received his BA in Anthropology, History, and German from the University of South Dakota in 2017. As an undergrad, Cale further developed his knowledge and interest in medieval European and Islamic coins and history, and began to apply the research methods he was learning at college to his personal collection. He also became deeply interested in studying the social functions of coins throughout history, a topic he continues to explore in his free time. Cale joined the Heritage Team full-time in January 2018 as a member of the World and Ancient Coins Department after interning during the end of 2017, and currently enjoys bringing his expertise and curiosity to the department's weekly internet and signature auctions. He is also working to refine his knowledge of Islamic coinage, an area of particular personal interest, to lead that division of the World and Ancient Coins department. His personal collecting interests include principally medieval hammered coinage from Europe and the Islamic world, though his collecting preferences remain quite varied and he is always interested to learn about new areas of coinage.
At age 12, Huib Pelzer eagerly traded his guitar for three Roman coins of Constantine the Great, marking the start of a lifelong fascination with numismatics and collecting. He earned his degree in social geography from the esteemed Utrecht University in 1992 before starting a travel agency immediately after graduation that specialize in organized tours of the Baltic States and most of Eastern Europe. In 1996, Huib partnered with Jacco Scheper to help lead MPO's expansion into the auction business.
While specializing in world and ancient coins, fine art and collectibles, Huib's day-to-day responsibilities include managing Heritage Auctions Europe's Amsterdam office and client services and support. He also organizes the office's appraisal days and manages the press. Huib is fully conversant in English, German, Dutch/Flemish and French.
Jacco Scheper started collecting coins and stamps in 1977 at the age of 7. After graduating from the famous international Business University Nijenrode in 1991, Jacco held various management positions. In 1996 he and Huib Pelzer acquired coin show organizer MPO, and eventually transformed it into an auction and trading company. MPO held its first auction in 1999. Within a few years MPO became the leading auction house for coins, banknotes and stamps in the Netherlands, and expanded its auction activities to other collectibles from 2011 onwards. In 2015 MPO’s superb reputation for integrity and expertise caught the attention of the owners of Heritage Auctions, which acquired MPO and its entire staff and rebranded it as Heritage Auctions Europe.
In 2006 Jacco was voted onto the board of the NVMH (Dutch association of Coin Dealers), and elected President of the board in 2009, serving a 6 year term ending in 2012. In 2015 he became President again. Jacco also serves as one of the experts of the NVMH Committee for Numismatic Certification. He also served as a member of the board of SBN (Foundation to Promote Numismatics) from 2006 until 2015, is one of the judges of Krause's COTY (Coin Of The Year – Award), and holds memberships in TMV (Association for Registered Appraisers), Hobéon – recognized – and KGMPK (Royal Society for Coins and Medals).
Jacco is conversant in English, French, Dutch/Flemish and German.
A collector of coins and stamps starting in 1983, Jan and childhood friend Jacco Scheper visited numerous shows together starting in high school. After earning a journalism degree in 1992, he spent seven years in media before volunteering to help with Jacco's new venture at MPO once the company began auctioning in 1999. Jan officially joined the firm in 2001 as a specialist in Dutch medieval, provincial and colonial numismatics and now plays a vital role with the newly formed Heritage Auctions Europe.
Jan's experience in auctioneering and consigning during his 16-year tenure with MPO has made him an expert on Dutch and European Currency. A member of the NVMH (Dutch Association of Coin Dealers) catalog, he is multilingual in English, Dutch, German and French.
A 17-year veteran of the Dutch auction scene, Idsard began collecting stamps as a child before also moving onto coins. After graduating in 1998 with a degree in Geophysics and Geography from the Netherlands' prestigious Utrecht University, he joined MPO when the company held its inaugural auction in 1999, and has continued to be an integral member of the firm since.
A native of Vlissingen, Netherlands, Idsard specializes in stamps, world numismatics, medals and decorative arts. He is multilingual in English, Dutch and German.
Heritage in 2013 after graduating from the University of Chicago with degrees in Classics and History, Sam’s responsibilities include working with consignors
and buyers, all stages of catalog production, as well as market research and
data analysis. He previously worked for Classical Numismatic Group and Harlan J. Berk, ltd.
Max received an MA in Classics from Universitá degli Studi of Pavia, Italy. A lifelong coin collector, he has worked for a number of prestigious firms including Christie’s Rome, Astarte S.A. in Lugano, Spink and Son and Classical Numismatic Group in London. Most recently he has been partnered with Mathioudakis at London Coin Galleries Ltd. since 2014. In the last 18 years Tursi has acquired extensive experience in both the retail and the auction world. Focusing mainly on ancient coins, his area of expertise extends to European medieval and modern coins.
Christian Winge has had a passion for collecting and
studying coins since a very young age growing up in Denmark, his home country. In 1997 Christian moved to the United States and eventually earned a Bachelor of Science degree from Trinity
University, where he graduated with dual major in Finance and
Economics. While subsequently working in consulting for EMC (now Dell-EMC), and
later teaching advanced Economics, he continued to study and trade coins, with a particular focus on 19th century European issues. This continued interest eventually led Christian to the World and Ancient Coins department at Heritage, where he plays an important role in client relations and in building and cataloging major auctions.