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MLB Official Info

MLB Executives

Jonathan Mariner
Chief Investment Officer
Jonathan Mariner

Jonathan Mariner was appointed Chief Investment Officer of Major League Baseball by Commissioner Robert D. Manfred, Jr. on December 4, 2014. In this capacity, Mariner will manage the industry's Baseball Endowment fund, its pension assets and potential new strategic investments.

Mariner served as MLB's Chief Financial Officer from 2002 until taking on his new role. On January 1, 2004, he was promoted from Senior Vice President to Executive Vice President, Finance by Commissioner Allan H. (Bud) Selig. Mariner upgraded MLB's financial function, created a league-wide risk management program to insure all property and casualty risks across the league through a new captive insurance company; improved the budgeting and financial reporting of MLB's Central Offices; and implemented an improved club financial reporting and long range forecasting process. He also negotiated the industry's $2 billion line of credit and helped Clubs transition to new debt-service rules.

Before joining MLB, Mariner served as Executive Vice President and CFO of the Florida Marlins. He was responsible for directing all of the Club's day-to-day financial and administrative operations, including financial reporting, budgeting, payroll, and cash management, as well as human resources, information technology and risk management functions. He also served the franchise as President of the Marlins Ballpark Development Corporation, which worked on a new ballpark proposal in South Florida. Immediately before joining MLB, Mariner served as Executive Vice President and Chief Operating Officer of Charter Schools USA, one of the nation's leading charter school development and management companies.

Mariner earned a B.S. degree in accounting from the University of Virginia, and received an MBA from Harvard Business School. Mariner has three adult sons.