Former MLB CFO, Jonathan Mariner, Joins Harbinger Sports Partners as GP

Atlanta, GA July 07, 2025 --(PR.com)-- Harbinger Sports Partners Fund I, LP, the $750 million private equity fund focused on minority investments in major U.S. professional sports franchises, led by industry heavy weights Mark Cuban, Steve Cannon and Rashaun Williams, proudly announces the appointment of Jonathan Mariner as General Partner.

A transformative figure in the business of sports, Mariner brings more than two decades of leadership at the highest levels of professional leagues, teams, and corporate boards. As former Chief Financial Officer and Chief Investment Officer of Major League Baseball, Mariner helped guide the league to sustained profitability, oversaw its $2 billion league-wide credit facility, and managed the creation and growth of MLB’s strategic investment fund to over $1.2 billion in assets. His career also spans roles as CFO of the Florida Marlins, Florida Panthers, and Dolphins Stadium, as well as significant board service across multiple Fortune 500 companies and innovative ...