Greg, who was born and raised in Pasadena, California, was introduced to the world of numismatics by his uncle, Gene Calvert. One year, when he was about 11 years old, his uncle gave him a coin album for Christmas. Two years later, Greg attended his first coin club meeting with his uncle. F​rom these initial experiences Greg soon developed into a collector, but equally quickly to develop was his interest in the business and trading side of the rare coin market.
 
During his high school years, Greg learned that he was able to mak​e extra money buying and selling coins. His transition from a hobbyist to a dealer came naturally, especially since weekend trips to local coin shows provided Greg with enough money that he did not need to have another job while going to school. He eventually ended up selling coins to his high school principal as well as his friends.

After graduating from high school, Greg began attending college while also working for Nick Buzolich, Sr. and Nick Buzolich, Jr. at Quality Coin Exchange, a father-son wholesale partnership. The year was 1980, and Greg credits them with giving him his first formal education in the coin industry.

Greg next moved on to a coin buyer position with a retail operation in Newport Beach, California. During his nine-year tenure with the firm he helped bring in more than $120 million worth of coins. He started his own coin business in 1990.

Today, as CEO of Stack's Bowers Galleries and Amark, Greg manages an international collectibles network with affiliates headquartered on three continents.

Greg is a member of the Professional Numismatists Guild (PNG), a life member of the American Numismatic Association (ANA), and a member of the Industry Council for Tangible Assets (ICTA). He is married, loves spending time with his children and is a big fan of the California Angels and Los Angeles Lakers.

​Brian began his tenure as President of Stack’s Bowers Galleries in July 2013 after Spectrum Group International combined its numismatic operations — Stack’s Bowers Galleries, Teletrade, and Spectrum Numismatics — to create a single, unified brand, known as Stack’s Bowers Galleries.​​

 Before being named President, Brian was Director of Operations of Spectrum Group International and was responsible for the company’s worldwide numismatic operations, as well as end-to-end management of Spectrum Group International’s auction houses specializing in rare and fine wines, collectible and antique arms and armor, and philatelics.​

Prior to joining Spectrum Group International, Brian worked as an investment banker from 2004–2009 at Roth Capital Partners, a full-service investment bank dedicated to the growth of small- and micro-cap companies. While at Roth, Brian completed several mergers and acquisition assignments, as well as a number of equity and financings totaling over $1.6 billion of transaction value, primarily for consumer and Internet clients.

Brian earned a Bachelor of Science degree in Business Administration with a dual emphasis on Corporate Finance and Investment Markets from the University of Southern California.

​​Andrew Glassman​ graduated from California State University, Fullerton in 1989 with Bachelor of Arts degree in Accounting, and completed his Certified Public Accountant requirements in 2003. He joined Spectrum Numismatics in 1991 as Controller, took over as Chief Financial Officer in 2000, and as President in 2009. He also served as member of the Board of Directors for Spectrum Numismatics. He is currently an Executive Vice President of Stack’s Bowers Galleries.​During Andrew’s time with Spectrum Numismatics, the fir​​​m grew into an internationally recognized, preeminent rare coin and currency dealer. Now as part of the Stack’s Bowers Galleries executive team, he strives daily to uphold and expand the company’s tradition of being the most active buyer and seller of rare coins, and considers himself extremely fortunate to work with one of the finest staffs in the entire rare coin industry.​​

Andrew is a member of the Professional Numismatic Guild (PNG) and the American Numismatic Association (ANA). He has been married 20 years and has two children. An avid baseball fan, Andrew coached little league for eight years.​​

Jeff holds a Masters of Business Administration from Pepperdine University and a Bachelor of Arts in History from Cornell University. Upon his graduation from Cornell in 1998, Jeff chose to pursue a life-long love of coins. Since then, his passion for coin collecting has blossomed into a successful and rewarding career.​​

Jeff launched his professional numismatic career in 1999 when he went to work for Heritage Numismatic Auctions (now Heritage Auction Galleries) in Dallas, Texas. There he served as both a Cataloger and the Catalog Production Manager for the firm’s U.S. coin catalogs, handling thousands of rare and important United States coins. He also designed and wrote many of the marketing pieces produced by the firm during his tenure. After a short stint as a Cataloger with Superior Galleries of Beverly Hills, Jeff moved to California in 2004 to accept the position of Director of Numismatics with Bowers and Merena Auctions of Irvine. He later served as Vice President of Numismatics at Rare Coin Wholesalers of Dana Point, California.​​

In addition to extensive numismatic cataloging and marketing experience, Jeff is a widely read numismatic writer credited with groundbreaking work in the field. His first book, Collecting & Investing Strategies for United States Gold Coins, was published early in 2008. Delving deeper into the U.S. gold series, Jeff then completely updated and revised David W. Akers' classic work A Handbook of 20th-Century United States Gold Coins: 1907-1933. Additional books authored include Collecting & Investing Strategies for Walking Liberty Half Dollars — the first book published on this important and popular series in 15 years — Collecting & Investing Strategies for Barber Dimes, What to do with Granddaddy's Coins: A Beginner's Guide to Identifying, Valuing and Selling Old Coins and a forthcoming title Collecting & Investing Strategies for Peace Dollars. Jeff also served as sole editor of the book World's Greatest Mint Errors by Mike Byers.​​

Jeff has also authored numerous articles. A market analysis entitled, “Profit from the Central America Treasure? — Previous Coin Hoards Suggest a Surprising Opportunity” appeared in the February 2001 edition of Rare Coin Investment Trends. Turning his attention to proof Liberty Seated Dollars, Jeff authored “Proof 1840 Seated Dollar Restrikes” for Volume 28, Issue No. 83 of The Gobrecht Journal. This article was reprinted in the May 7, 2002 edition of Numismatic News under the title “Restrike Proof 1840 Seated Dollars Possible.” Two follow-up articles on proof Liberty Seated Dollars, “Reverse Die Dates 1854 Dollar Restrike to 1859” and “Restrike Proof 1856 Seated Dollar Confirmed,” appeared in the June 4, and July 30, 2002 editions of Numismatic News. Works published in Coin World include "The Last Double Eagle” (co-authored), which appeared in the June 3, 2002 edition. Two additional articles, “Unique Indian Eagle May Have Been First” (November 11, 2002) and “Republic Shipwreck Yields RPM $20” (February 7, 2005) garnered front-page exposure.​​

From 2009–2011, Jeff served as a Market Analyst for Coin Values magazine. During that time he authored two articles that received front cover exposure in the publication: “Truth Time for Barber Dimes" featured in the March 2010 edition; and "Learning to Walk" (about Walking Liberty Half Dollars) appeared in the June 2010 edition.​

Jeff received an Extraordinary Merit Award from the Numismatic Literary Guild (NLG) in August 2002 for his article titled “Proof 1840 Seated Dollar Restrikes” that appeared in The Gobrecht Journal. A second Extraordinary Merit Award from the NLG followed in August 2010 for his book Collecting & Investing Strategies for Barber Dimes.​​

Early in his career, Jeff's achievements as a numismatist were honored with a scholarship to attend the American Numismatic Association (ANA) Summer S​eminar. In 2007, he came full circle, this time returning to the ANA Summer Seminar as an instructor and originator of the course "Attributing United States Coins." Jeff is a member and supporter of the ANA and the NLG, and he has been a contributor to the well-known book A Guide Book of United States Coins (The Official "Red Book" of U.S. coins) by R.S. Yeoman since 2008.​​

In 2007, Jeff founded Ambio Rare Coins, Inc. and also graduated from the Texas Auction Academy. Through his business, Jeff worked as a technical and marketing consultant for rare coin auction houses, dealerships and brokerage firms across the United States, including Bowers and Merena Auctions (now Stack's Bowers Galleries) in Irvine, California.​

In 2011, Jeff returned to Stack's Bowers Galleries to accept the position of Vice President of Numismatics and Auction Production. In this capacity he continues to serve as one of the firm's senior numismatists for United States coins and exonumia, trains and supervises the Stack’s Bowers Galleries numismatic cataloging staff, and manages the overall catalog production process for the firm’s U.S. coin and exonumia sales.​​​​​​​

Wayne Berkley started his numismatic career in 2012 with Teletrade.com where he worked with thousands of coin collectors and dealers to buy and sell their coins via the industry’s first online platform. In 2014, when Teletrade merged with Stack’s Bowers Galleries, Wayne was brought in to quickly grow the company’s Internet only auctions into what is now the Stack’s Bowers Galleries Collectors Choice Online Auction. In 2015, Wayne was promoted to Director of Client Services. In this position he works closely with bidders and consignors to build the Stack’s Bowers auction program. Wayne is a licensed auctioneer in multiple states, and has hammered tens of millions of dollars in coins and currency for the firm’s events since 2015.
Prior to joining Stack’s Bowers Galleries, Wayne was a banker and eventually manager with Wells Fargo Bank in Tampa, Florida. During his banking career, Wayne worked closely with investment and private banking clients to help them achieve their financial goals.  While at Wells Fargo Bank, Wayne was recognized as the top banker in his region for both Customer Service and Sales for 2008-2009.
Wayne holds a Bachelor’s Degree in Applied Economics and Business from The Florida State University. He is a member of the American Numismatic Association, Professional Numismatics Guild (PNG), and Florida United Numismatists.

Always interested in coinage and history, Jeremy inherited the coin collecting gene from his maternal grandfather. He began in the hobby as many often do—seeking out U.S. type coins and reading the Red Book from cover to cover. While in college, he began working part-time in the brick-and-mortar coin shop that he had visited throughout his youth. There, he gained valuable experience from the “other side of the counter,” interacting with the public by selling to and buying from customers, as well as sorting and cataloging purchases and setting up at local and regional coin shows.
He continued his experience in the trade by spending the past 12 years working at numerous prestigious auction houses and firms, chiefly in charge of cataloging and presenting ancient and world coins from all areas, as well as researching exonumia (such as medals and tokens), communicating with customers regarding the evaluation and placement of their consignments, and serving as a representative on  bourse floors and at auctions.
He now brings this wealth of knowledge Stack’s Bowers Galleries, where he is a main contributor to the cataloging and presentation of ancient coins, world coins, and medals. He also conducts research for our popular “Coin of the Week” blog posts. He considers medals to be an unexplored treasure, representing a true “final frontier” of the hobby, and he enjoys shedding light upon this highly interesting niche aspect of numismatics.

Cassi East started her career in the collectibles industry in 1997 with Kingswood Coin Auctions. In 1998 she was promoted to DIrector of Auctions for all auction companies then owed by Collectors Universe (Auctions by Bowers and Merena, Kingswood, Good Rockin' Tonight, Odyssey Auctions, Lyn Knight Currency, and Superior Sports Auctions). In 2003 Collectors Universe sold the auction divisions and Cassi stayed on with CU as Director of Customer Service, charged with managing the customer service staff of the authentication and grading services. In 2006 the company purchased Certified Coin Exchange (CCE), a sight-seen/unseen, rule-governed trading system for coin dealers, and appointed Cassi President. In 2012, Cassi was appointed President of Long Beach Expo, the largest Coin, Currency, Stamp and Sports Card Collectible Show.​​

Nicholas got his entry into the world of coin collecting in elementary school, starting with collecting State Quarters and Wheat Cents from pocket change. His love of the hobby was supplemented throughout his time in High School and College as a vest pocket dealer at shows in the Northeast buying and selling world coins. While Nicholas catalogs and works with the entire breadth of World and Ancient coinage, he has particular interest in Indian and Islamic Coinage, along with having an interest in and cataloging highlights from Poland, Russia, China, and Britain. Nicholas maintains an active coin collection, mostly Indian coins from the Mughal Empire.

Outside of the office Nicholas earned a master’s degree in philosophy from the University of Leeds and still loves reading philosophy in his free time. He is a big Philadelphia sports fan and collects Philadelphia sports autographs. He also has a great fondness for riding his road bike in Southern California, and most weekends you can find him out on the road.

R​onald J. Gillio is an internationally renowned rare coin dealer, auctioneer, author and researcher who has been active and influential in numismatics for more than 45 years. He joined Stack’s Bowers Galleries in early 2007 as Numismatic Acquisition Coordinator and U.S. and World Coin and Currency Specialist, a position that includes purchasing and obtaining consignments.​

Ron’s involvement in numismatics literally spans the globe. In addition to his work with Stack’s Bowers Galleries, he continues as general chairman of the popular Long Beach and Santa Clara, California Coin, Stamp & Collectibles Expos on behalf of the shows' owner, Collectors Universe, Inc. He also continues his retail store in Santa Barbara, California — Gillio Rare Coins & Fine Jewelry, a division of Ronald J. Gillio, Inc. — one of the largest buyers/sellers/importers of rare coins in the United States. He has conducted nearly 80 multi-million dollar auction sales in the United States, Europe, Hong Kong, Japan and Singapore, and his résumé includes such well-known names as Pacific Coast Auction Galleries, Butterfield Auction Galleries, Robert R. Johnson, Inc., Baldwin's Auctions of London, Spink London, Taisei Stamps & Coins of Hong Kong and Singapore, and Butterfield-Johnson-Gillio. He is an official appraiser to the State of California and served as an auctioneer for the United States Marshall's Office.​​​

A respected member of the most esteemed numismatic associations, Ron is a past president of the Professional Numismatists Guild (PNG), as well as the recipient of the Founders Award, the highest honor of the PNG. He is a Life Member of the American Numismatic Association (ANA), and has been a member of the International Association of Professional Numismatists (IAPN) for more than two decades. He is also founding charter member No. 11 of the ​Professional Coin Grading Service (PCGS). Well known for his writings and research in the field, Ron collaborated with Walter Breen in the writing and publishing of the new standard reference book California Fractional Gold. In 1984, he became a contributor to the 37th edition of A Guide Book of United States Coins (The Red Book), and has appeared as such in every subsequent edition. He has also been a contributor to the Standard Catalog of World Coins, the Official ANA Grading Standards for United States Coins, and the Coin World Almanac.​

Ron is based in our Santa Barbara, California office and can be reached directly at 805-637-5081

Over the past decade Aris has established himself as a leading expert in the field of World paper money, having auctioned or brokered tens of millions of dollars’ worth of banknotes, domestically and internationally. Aris has handled at least one-third of the individual World banknotes that have realized over $50,000 at public auction in the past five years. He has a passion for forging relationships with both dealers and collectors, and assesses each deal with fairness, no matter the value of the note or size of the collection. His efforts have aided the rapid growth of the World Paper Department at Stack’s Bowers Galleries and contributed to the growth of the hobby itself.

Aris works closely with dealers, hobbyists, and other firms to finalize private treaty deals such as the record-breaking set of Zanzibar banknotes. In 2017, in collaboration with our Hong Kong office, Aris oversaw the sale of a complete set of People’s Republic of China notes. This featured the coveted 1951 10,000 Yuan for $358,000, which remains the highest priced single World banknote sold by a major U.S auction house. Additionally, his efforts to procure and subsequently auction the rarest treasures of World paper money have comprised handling complete sets of first issue Imperial Bank of Persia notes, the Arias Issue from Panama, the extremely rare Haj Pilgrim sets, some of the rarest Canadian notes, and many other rarities from highly collected countries around the globe.

Aris is a member of all major numismatic guilds and associations and attends all major shows both domestically and internationally. In his spare time, he treasures taking his pups to the beach with his girlfriend, traveling, savoring the best coffee or wine, and making pizza from scratch. He is a lifelong New York Knicks fan, but has also experienced many joyful sporting moments as a fan of both the New York Yankees and the New York Giants. He has lived in New York City and Boca Raton, Florida, but has resided in Southern California since 2015.​

Ben Orooji has been an ardent collector for over 15 years. He was a vest pocket dealer for six years before joining Stack’s Bowers Galleries in early 2013 as a numismatist and cataloger. Ben specializes in the Capped Bust, Reeded Edge half dollars of 1836-1839 and is an expert with all federal U.S. coins. His cataloging and research have been instrumental to our offering of countless numismatic rarities in our award winning catalogs. He is also a frequent contributor to our weekly U.S. coin blogs. While primarily a U.S. coin collector, Ben maintains an active and diverse collection including coinage of the Parthian and Sasanian empires, medals and tokens of U.S. and international exhibitions, coin jewelry and even a comprehensive collection of play money. ​​

 Ben is a graduate of the University of Maine with a Masters of Arts in Clinical Psychology, and the University of Central Florida with a Bachelors of Science in Psychology and Behavioral Forensics. After graduating from the University of Maine he worked in a maximum-security prison within the Florida Department of Corrections. The ethical care and rehabilitation of incarcerated individuals remains a cause about which he is passionate to this day. Ben and his wife, Tina, have been married for 10 years and have a daughter, Alyssa. He is first and foremost a family man and enjoys spending time with them and watching his daughter grow.​​​​​

Long before Matt discovered coins, he knew he had the collecting gene.  As  early as he can remember, it was always something: rocks in his younger years, and then baseball, basketball and football cards took over as his appreciation for sports developed in early adolescence.  Along the way, the introduction to small groups of coins saved by family members would spark a lifelong passion. 
Not long after getting the coin “bug,” eBay played a huge role in the development of the career side of his aspirations.  While selling rocks or cards at a profit was virtually impossible, the fledgling online auction venue presented real opportunities for a teenager to make some money in coins. Matt was able to do this by offering a pleasing presentation and excellent customer service.  Since that time, Matt has spent nearly 15 years at several prominent international auction houses, where he honed his craft, never forgetting his humble foundation: a commitment to customer service that brought his earliest successes.
Still a collector, Matt appreciates a broad spectrum of numismatic disciplines.  While the diversity of world and ancient coins receives the majority of Matt’s day-to-day attention, he still frequently finds himself searching for additions to his collection of medals and tokens depicting George Washington.  Because of their iconography, Matt also has a growing collection of Latin American coins. Depicting suns with faces, soaring mountains and native landscapes, he believes this area of coins parallels the beauty of painted art more closely than any other.

Chris Ortega has worked in the auction industry since 2003, gaining experience as a bi-lingual auctioneer and personal property appraiser. He began his career working with various government agencies, state and local municipalities, and national consumer banks conducting on-site appraisal valuations and liquidation auctions.
In 2010 he took a break to launch a luxury boutique specializing in high-end designer goods. To expand the business he successfully completed the Diamond Grading Course at the Gemological Institute of America and utilized digital marketing to further grow the business. While the business was a success, Chris decided to use his new-found expertise to return to a career in the auction industry.
Since 2017, Chris has served as an auctioneer and numismatist at Stack’s Bowers Galleries. He is responsible for identifying and evaluating all incoming consignments, collections, and preparing them for auction. His favorite coin motifs are the Draped Bust and Gobrecht silver dollar designs. Highlights of his career as an auctioneer include the sale of two 1804 silver dollars, one from the Pogue Collection and one from the Larry H. Miller Collection, as well as an 1894-S Barber dime. Each of these numismatic rarities realized an excess of one million dollars.
Outside of the office Chris enjoys jogging and exercising, researching wrist watches, and spending time with his family.

John has been involved in numismatics for over 35 years. Previous to relocating to our corporate headquarters in California, John worked with Q. David Bowers in our Wolfeboro, New Hampshire office for 15 years. During that time he worked with consignors guiding their collections through the auction process under the firm names Auctions by Bowers and Merena, American Numismatic Rarities, Stack’s, and Stack’s Bowers Galleries.

John is one of our primary contacts for auction consignments, and personally oversees many aspects of our auction presentations. He has worked with thousands of consignments over the years, including such well-known names as Eliasberg, Norweb, Bass, Pogue, and many others that would be readily recognized from our catalogs. His numismatic interests cover a broad spectrum but are presently focused mostly on American numismatics.

In addition to working with consignors, he regularly catalogs special projects including, most recently, the Twin Leaf Collections of United States Large Cents and State Coppers, Washington medals from the William Spohn Baker Collection on behalf of the Historical Society of Pennsylvania, the Larry Ness Collection of Indian Peace Medals and the D. Brent Pogue Numismatic Library. Earlier projects of note include our presentations of the American Bank Note Company Archives, the archives of Louis E. Eliasberg, Sr., the treasure coins of the S.S. New York, the native gold crystals from the Roraima Shield Collection, the record-setting presentation of the Harry W. Bass, Jr. Collection of United States paper money in 1999, and many other smaller offerings.

As a member of a family with three generations of numismatists, it was with great anticipation that Kyle Ponterio continued his family tradition. Kyle joined Ponterio & Associates in 2005, when he started out packaging in the shipping room, along with imaging for the print and online catalogs. Soon after, with the guidance of his father Rick Ponterio, and brother Kent Ponterio, he began learning numismatics at a rapid pace. He then started cataloging coins for auction, doing numismatic research, and buying and selling coins, as the latest numismatic specialist at Stack's Bowers Galleries.

Although Kyle credits his father and brother for his success in numismatics, he brings a fresh new pair of eyes to the company. He enjoys traveling to shows because it gives him the opportunity to look at other's cases and enjoy their collections. Kyle collects sun face coins and necessity money. He is an American Numismatic Association (ANA) member, and also attends monthly meetings of the Greater Orange County Coin Club.​​​

Richard Ponterio began collecting coins as a young boy at about the age of 10. His interests in numismatics first peaked while working for his uncle who owned a vending machine company. During the summer, Rick would accompany his uncle along his route, re-stocking the machines and collecting the monies which had been deposited. At the end of each day, the two of them would search through the coins for dates and varieties they needed for their collections. In 1972 he decided to make numismatics his full-time profession.​​​​

From 1974–1982, he helped co-found the firm Ponterio & Wyatt, conducting mail bid auctions, price lists, and attending major coin shows. In 1982, he formed the company Ponterio & Associates, which was accepted into the International Association of Professional Numismatist (IAPN) in 1988. He also served on the executive committee of the IAPN for eight years. He joined the Professional Numismatists Guild (PNG) in 1979, and served on its board of directors for six Years. He is an ANA life member and is the president of the New York International Numismatics Convention.​

Steve Price started collecting coins at the age of 9. After serving in the Marine Corps, Steve pursued his passion for numismatics and opened his coin store, Penny Lane Coin, in Costa Mesa, California. Shortly after opening his store he began working as a consultant for Stack’s Bowers Galleries, a position that soon developed into a full time job with the company. Steve’s area of expertise is United States coins, a field in which he is well versed in market values. He also enjoys research on varieties and mint errors.​

Larry spent the early part of his life in Texas, later moving to the Saint Louis, Missouri area, where he now resides. A lifelong coin collector, Larry attributes his passion for numismatics to his parents, who introduced him to the hobby at an early age by encouraging collecting wheat cents from circulation and saving up to buy the occasional Morgan dollar from the local coin shop. Larry’s collection is always changing but he has a particular fondness for high end United State type coins and the Spanish colonial coinage of Mexico.

A maker / engineer by nature, it was not long before Larry looked to combine his loves of technology and numismatics, creating innovations including Stack’s Bowers Galleries’ patent pending technology: Coins in Motion. Coins in Motion creates high resolution coin animations that accurately capture the in-hand visual appeal of rare coins and other numismatic treasures.

Larry spends much of his free time cultivating the next generation of coin collectors, including by creating and producing content for online locations where the younger generations gather – YouTube, Reddit, Instagram, etc. He has been on the moderation team for Reddit.com/r/coins for the better part of a decade, a community that has seen a nearly 700% growth in membership (to over 71,000 by the end of 2020). These are almost exclusively younger collectors. Larry also maintains an active numismatic YouTube channel with over 100 videos.

With over 20 years of experience as a professional numismatist, Peter Treglia brings a wealth of knowledge to his position as Director of Currency for Stack’s Bowers Galleries. He purchased his first coin at the age of 14, became a dealer almost immediately at age 15, and quickly discovered paper money, thanks to the Internet. After collecting paper money for about a year, Peter started selling notes on eBay. Once he realized that he could make money-trading currency, he immediately became hooked.

In February 2005, Peter was hired as one of the five original currency graders for Paper Money Guaranty (PMG). After working for PMG for seven months, Peter left the firm to start his own currency venture. Soon after, Spectrum Group International CEO Greg Roberts asked him to lead the Spectrum Numismatics (now Stack’s Bowers Galleries) currency division. Since the Stack’s Bowers Galleries/Spectrum Numismatics/Teletrade merger, he has overseen the Stack’s Bowers Galleries paper money cataloging and consignment teams, in addition to his primary duties buying currency.

Peter is a Life Member of the American Numismatic Association (ANA) and the Society of Paper Money Collectors (SPMC), and is also a member and Past President of the Professional Currency Dealers Association (PCDA).