Sumit Khanna started his career working as an assistant to directors Aziz Mirza, Saeed Mirza and Meghna Gulzar on various feature films and documentaries. He made his first independent documentary, for PSBT, on the lives of assistant directors in the Mumbai film industry. Since then, he has made numerous documentaries, corporate films and promos for feature films. He was associate producer on the acclaimed film Parzania. His films Mere Desh ki Dharti and The Man who Dwarfed the Mountains, for PSBT, won National Awards and Movement, A World, A Cinema - the Indian New Wave, screened at the National Museum of Indian Cinema.