Tata Sons' Chief Ethics Officer Mukund Rajan has resigned from his post citing personal reasons. Mukund Rajan, brother of ex-RBI Governor Raghuram Rajan, will leave the group to evaluate entrepreneurial pursuits, the company has said. Mukund worked with Tata Group for over 23 years and was the youngest director appointed on the boards of major Tata subsidiaries including Tata Teleservices.