Prakash Kumar is the son of G Venkatesh and playback singer, A. R. Reihana, elder sister of music director A. R. Rahman. He married singer Saindhavi, with whom he studied at Chettinad Vidyashram, on 27 June 2013 at the Mayor Ramanathan Chettiar Hall in Chennai. He first appeared as a vocalist on the soundtrack of director S. Shankar's Tamil film Gentleman, composed by his maternal uncle, A. R. Rahman. He has also contributed to some of Rahman's other projects. He had also worked with Harris Jayaraj and sang two songs in Anniyan and Unnale Unnale. His introduction as a film composer was in the critically acclaimed Tamil film Veyil, directed by Vasantha Balan and produced by the director S. Shankar. His music in the film Madrasapattinam directed by A. L. Vijay was appreciated mainly for his song "Pookal Pookum Tharunam". He went on to win critical acclaim for his music in Selvaraghavan's drama film Mayakkam Enna, which became his third collaboration that featured Dhanush in the lead role. The movie Darling songs were a hit. Prakash's songs in Kaaka Muttai were a massive hit. He signed his 50th film with Director Atlee that is Vijay 's 59th which is named as Theri. In 2013, Prakash Kumar launched his own production house under the name "GV Prakash Kumar Productions". His first film, Madha Yaanai Koottam was directed by Vikram Sugumaran a former assistant of Balu Mahendra. He is also acted in films that include Darling, Trisha Illana Nayanthara, Pencil. His upcoming movies are Bruce Lee, Enakku Innoru Per Irukku and Kadavul Irukaan Kumaru.