Our mission: to build the global standard for institutional digital asset custody

Founded in 2017, PolySign has luminaries in both the cryptocurrency and financial services spaces working to solve the biggest problem in crypto today: custody.

We’re paving the way for digital assets to become more mainstream, and we’ve got the team to do it.

Our Leadership Team

Jack McDonald
CEO and Board Member

Prior to joining PolySign, Jack McDonald was CEO of Conifer Financial Services for a decade, where he grew AUA from $5B to $125B culminating in a successful exit in 2016. Before Conifer, Jack was the Managing Director and Head of West Coast Equities at UBS. Jack was named one of the ‘20 Rising Stars of Hedge Funds’ by Institutional Investor Magazine and inducted into Global Custodian's 'Legends of The Industry'.

Arthur Britto
President, Founder and Board Member

Arthur Britto co-founded Ripple and designed the XRP ledger. Ripple has grown to over $30 billion in assets in just 5 years. Prior to Ripple, Arthur was CEO of Information Access Technologies Inc., one of the first ISPs. Arthur is a renowned technical leader in the digital asset space.

Kimon Papahadjopoulos
CTO

Kimon Papahadjopoulos comes to PolySign as a software process expert, having directed software processes for teams of over 600 engineers at companies like Hewlett Packard, DataDirect Networks and EMC. In addition, he managed software teams at Hewlett Packard and worked in the CTO’s office. Kimon is also a competitive inline and short track speed skater.

Anna Tong
VP Product

Anna Tong has worked for a decade at different technology companies. Prior to PolySign, she was the first product manager at Ripple, where she led all of Ripple’s consumer products, such as their exchange product and the first version of xRapid. She also led product and customer success at HomeLight, a series B funded real estate tech startup. Before working in startups, she worked at Google on their product and operations teams. Anna is a graduate of Harvard University.

David Schwartz
Board member

David Schwartz is Chief Technology Officer at Ripple. Along with Arthur Britto, David was one of the original architects of the Ripple consensus network. Prior to joining Ripple, David Schwartz was Chief Technical Officer for WebMaster Incorporated, a Santa Clara software developer. He developed encrypted cloud storage and enterprise messaging systems for organizations like CNN and the National Security Agency (NSA).

Tim Keaney
Senior Advisor and Board Member

Tim Keaney was the Vice Chairman of BNY Mellon, where he oversaw the firm’s Investment Services businesses, including the Custody and Fund Administration Business with responsibility for the oversight of 25% of the world’s investable assets. Prior to that, he was the BNY Mellon Chairman of Europe, Middle East and Africa. He is also Chairman of the Risk and Finance Committee and member of the Audit Committee at UNUM, a Fortune 200 Insurance company.