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Jonathan Mariner

Jonathan Mariner is a private investor, entrepreneur, and independent board member with more than two decades of experience working in […]

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JMariner
JMariner
Jonathan Mariner

Founder & President | TaxDay

Jonathan Mariner is a private investor, entrepreneur, and independent board member with more than two decades of experience working in professional sports. He’s currently the Founder and President of TaxDay, LLC, a private software firm that helps users track their multi-state travel for tax purposes.  He also serves as a Senior Advisor to Overtime Sports, the newest sports network focused on young, digital-native sports fans.  He spent over 14 years with Major League Baseball, as EVP and CFO under Commissioner Allan (“Bud”) Selig, and later as Chief Investment Officer under Commissioner Rob Manfred. Prior to that he served a 9-year stint as EVP and CFO of the Florida Marlins Baseball Club, and as VP and CFO of the Florida Panthers Hockey Club.  Mr. Mariner sits on the Board of Directors of Tyson Foods, Inc.; McGraw Hill Education; and The Investors Exchange (IEX). He also serves as a board member on Little League Baseball International; the Board of trustees at Darden School at the University of Virginia; and on the Knight Commission for Intercollegiate Athletics.  Mr. Mariner graduated from the University of Virginia with an accounting degree, received his MBA from Harvard Business School, and is a former Certified Public Accountant.

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