Inspired by Hollywood and British movies, Amarnath left home at a young age of 17 to join the film industry to become an actor.

While working as a junior artiste, he realized that the director played a very important role in the making of a movie.

However, his major break came in 1937 when Ramaniklal & Mohanlal Shah, founders of Mohan Studios, Mumbai, offered him the opportunity to direct "Danger Signal" in Tamil.

At first, he directed 5 Tamil movies for Mohan Studios; two of them, "Minnalkodi"[2] and "Veer Ramani" - both released in 1937 and both starring K.T.Rukmini and B.Srinivas Rao became super hits.

Some of them were - Ajit, Jayant (father of Amjad Khan), Murad, Pran (actor), Yakub, Gope, Mukri, Sajjan, Kishore Kumar, Shammi Kapoor, Joy Mukherjee, Sanjay Khan, Bharat Bhushan, Salim Khan, Mehmood, Madhubala, Geeta Bali, Meena Kumari, Vyjayantimala, Nutan, Nimmi, Nalini Jaywant, Nanda, Nigar Sultana, Noor Jehan, Kum Kum, Kamini Kaushal, Shakila, Shashikala, Helen, Cuckoo, Indurani and also K.T.Rukmini & B.Shrinavasa Rao in the Tamil movies directed by him.

[citation needed] Shyam Sundar composed many unforgettable melodious songs in 3 of the hit movies directed by K.Amarnath – "Gaon ki Gori"- 1945, "Bazaar" - 1949 and "Alif-Laila" 1953.

[8] Also, Minoo Mumtaz, sister of the famous Bollywood comedian Mehmood,[9] made her film debut in K.Amarnath's "Bara-Dari" - 1955.

K.Amarnath lived in Shivaji Park, Mumbai - was married to Sumitra Batra and had 4 children – 2 sons and 2 daughters - Satish, Manmohan, Manju & Madhu.