Baseball Commissioner Robert D. Manfred, Jr. today announced that Jonathan Mariner, most recently Chief Investment Officer for Major League Baseball, will depart effective May 31st, after more than 14 years of service to MLB. Prior to joining the Commissioner's Office, Mariner served as the Florida Marlins Executive Vice President and Chief Financial Officer for nine years.
Mariner started at the Office of the Commissioner as Senior Vice President & Chief Financial Officer in March 2002, under the leadership of Commissioner Allan H. (Bud) Selig. He was later promoted to Executive Vice President & CFO. Among his achievements during his tenure as MLB's CFO, he played a key role in the implementation of the league's debt-service rule, which has been a critical component in the league's current state of financial stability; created MLB's league-wide captive insurance company, now responsible for underwriting all team and stadium-related property and casual insurance exposures; was the Commissioner's liaison with the league's strategic investment fund, BELP; and designed and implemented a state-of-the-art, league-wide financial reporting system, which now provides timely, accurate Club-level reporting, as well and detailed metrics to help improve team and league operating efficiencies.
In January 2015, Commissioner Manfred appointed Mariner to be MLB's Chief Investment Officer, a role in which he was primarily responsible for overseeing the League's $1.5 billion pension plan, as well as continuing his oversight of the BELP investment fund and the captive insurance program.
Commissioner Manfred said: "Jonathan is a very talented professional who has long filled a significant role for the Office of the Commissioner. We are grateful for his many achievements in serving our Clubs, improving our financial systems and allowing the industry to operate more efficiently in a number of ways. I wish Jonathan the very best in the future."
Mariner said: "I thank Commissioner Manfred and Commissioner Emeritus Selig for giving me the opportunity to serve MLB and to work with so many outstanding colleagues as we achieved so much during my tenure. I'd like to especially thank the owners of the 30 Clubs and their employees for their continued support and feedback as we worked to serve their best interests and the interests of this great game. It was an honor and my distinct privilege to work with them."
Mariner earned a B.S. degree in accounting from the University of Virginia in 1976 and received an MBA degree from Harvard Business School. He is also a Certified Public Accountant. Mariner began his career in baseball when he joined the Marlins in February 1992 as Vice President and Chief Financial Officer, the year prior to their 1993 inaugural season. Working for team owner Wayne Huizenga at the time, he briefly held the role of VP and CFO for the National Hockey League's Florida Panthers before their inaugural season began in October 1993.