At Blackstone, Jain sat on the boards of Essel Propack, Aakash Educational Services, Sona Comstar, Fino Payments Bank. : Private equity firm Carlyle on Monday announced that Amit Jain has joined the company as a managing director based in Mumbai and co-head of Carlyle’s India investment advisory team. Jain’s previous stint was with rival Blackstone, where he worked for 10 years and was most recently a senior managing director in its Mumbai office.