New Delhi, Sept. 21 -- Senior Advocate Abhishek Manu Singhvi has emerged as one of the key legal figures in the escalating dispute between Tata Trusts and Tata Sons.

Neol Tata-led Tata Trusts has appointed Singhvi to represent it in opposing the reappointment of N Chandrasekaran as chairman of Tata Sons and the proposed listing of the Tata group holding company.

The Trusts, which hold about 66% of Tata Sons, have challenged the validity of the September 17 board resolution reappointing Chandrasekaran for another five-year term.

Singhvi said he entered the dispute with "sadness and regret", citing his association with the late Ratan Tata.

His appointment is also notable because he was part of the Tata side's legal team during the earli...