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Giants President and Co-Owner John Mara Announces Cancer Diagnosis, Will Stay Involved During Treatment

The 70-year-old disclosed no specifics about the illness, requesting privacy.

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Sep 28, 2025; East Rutherford, New Jersey, USA; New York Giants co-owner John Mara looks on before the game against the Los Angeles Chargersat MetLife Stadium. Mandatory Credit: Brad Penner-Imagn Images

Overview

  • Maria announced the diagnosis in a statement released by the team on its official social channels and website.
  • He said he feels strong and optimistic and plans to remain active with the Giants throughout treatment.
  • The statement did not identify the type or stage of cancer.
  • Mara was at MetLife Stadium for Sunday’s 21–18 win over the Chargers, the team’s first victory of the season.
  • A third-generation steward of the franchise and president since 2005, he has overseen two Super Bowl titles as the Mara and Tisch families continue to control the team, with a separate 10% minority stake sale to Julia Koch awaiting NFL approval.