About Us

STEFAN LEON

CHIEF OPERATING OFFICER

Graduated from West Chester University with a Bachelor’s Degree in Finance and Economics and has worked in the financial services field for the last 10 years. Stefan grew up in the card business and continues to assist his father with GCB's affiliate store, S&B Sports Collectibles. He resides in Philadelphia with his loving fiance. Stefan is a Huge Sixers, Eagles and Chelsea Soccer fan!

ADAM GOLDSTEIN, CPA

CHIEF EXECUTIVE OFFICER

Graduated from Temple University with a Bachelor's Degree in Accounting and Legal Studies. Adam worked in public accounting as well as private equity for almost 10 years and has been a licensed CPA since 2014. He grew up in the card business as his family owned "Mazz Cards" the local card shop for over 20 years in Clarks Summit, PA. Currently, he resides in New Jersey, right outside of Philadelphia, PA, with his loving wife and three children. Adam is an avid Cowboys fan and Ja Morant collector!

ABIGAIL WALLS

MANAGER OF OPERATIONS

Graduated from Temple University with a Bachelor's Degree in Entrepreneurship and Innovation Management. Abigail has experience in managing the operations at gym facilities, as well as managing inventory processes for distributors. She has been with GCB for almost a year and develops, implements, and reviews operational policies and procedures. She resides in Southampton with her fiancé and is passionate about opening her own business in the future.