Mr. Mariner is a private investor and entrepreneur, having recently retired from 23 years in professional sports. Just prior to retiring, he was appointed by MLB Commissioner Rob Manfred to serve as Chief Investment Officer of Major League Baseball, where he was responsible for overseeing approximately $2 billion in combined league-wide pension assets and MLB’s strategic investment funds. He also served as President of the league’s captive insurance company, BASES, which provides property and casualty insurance coverage to all 30 MLB teams and ballparks.
During his 12.5 years serving as Executive Vice President and CFO of MLB, his responsibilities included overseeing the League’s treasury, budgeting, league and team related financial reporting, and risk management activities, as well as managing MLB’s $2.0 billion league-wide credit facility; and providing quarterly updates at MLB Owners’ Meetings on the industry’s financial health. Mr. Mariner previously served as Executive Vice President and CFO of the Florida Marlins Baseball Club; and as VP and CFO for the Florida Panthers Hockey Club during their initial start-up and inaugural seasons.
He currently serves on several corporate boards: McGraw Hill Education; The Investor’s Exchange (IEX), the new, SEC-approved public stock exchange featured in Michael Lewis’ book, “Flash Boys;” and Ultimate Software Inc. He also currently serves on the University of Virginia’s Darden Business School Board of Trustees; Little League Baseball’s board of directors; and the Knight Commission on Intercollegiate Athletics.
Mr. Mariner has a B.S. degree in Accounting from the University of Virginia; an MBA degree from Harvard Business School; and is a former Certified Public Accountant. He has been featured on the cover of CFO Magazine, and was included among the Top 10 in Sports Illustrated’s annual listing of the “101 Most Influential Minorities in Sports.” Mr. Mariner has also been a frequent public speaker on the topic of the business of professional sports.