Ousted Tata Trusts' trustee Mehli Mistry has written a letter to the trusts' Chairman Noel Tata, who was named Ratan Tata's successor last year, amid a dispute over the Tata Group's control, NDTV Profit reported. "Precipitating controversies will cause irreparable harm to the reputation of Tata Trusts," he wrote. He also noted that "no one is bigger" than the institution.