Jack McDonald is the CEO of PolySign, the digital asset infrastructure company founded in 2018. PolySign is the parent company of Standard Custody, a qualified custodian for digital assets licensed by the state of New York, as well as MG Stover, the largest digital fund administration firm servicing hedge funds, private equity funds, and venture capital funds.

Prior to helping start PolySign, McDonald was president and CEO of Conifer Financial Services from 2008 to 2016. Before he assumed the role of CEO, McDonald held the position of executive vice president, where he was responsible for business development within the organization. He also spent five years with UBS Investment Bank, where he was responsible for the institutional equity business for UBS’s western region as managing director. His career in finance began with Schroder’s in New York as a vice president of institutional equity sales.

McDonald has been recognized as one of the "20 Rising Stars of Hedge Funds" by Institutional Investor Magazine and inducted as a legend “for his development of industry-leading ideas in client service and exceptional growth of the Conifer Fund Services business” by Global Custodian. He earned a Bachelor of Arts from Georgetown University's School of Foreign Service in 1988 and a Juris Doctor from Georgetown Law Center in 1993. McDonald has received numerous awards, such as the Gregory J. Carroll Award for outstanding service to Georgetown Athletics and the William Gaston Award to honor his contributions to Georgetown University. He is also a frequent contributor to industry press and has been featured by popular media outlets like CNBC and Bloomberg TV.