Larsen and Toubro (L&T) Group Chairman AM Naik has been appointed as the Non-Executive Chairman of mid-sized IT services firm Mindtree on Wednesday. The move follows L&T's acquisition of a controlling stake in the Bengaluru-based company. Mindtree CEO Rostow Ravanan, Executive Chairman Krishnakumar Natarajan and Executive Vice Chairman NS Parthasarathy had resigned earlier this month.