Karthi is a Indian film actor who works in the Tamil film industry. Son of veteran actor Sivakumar and younger brother of Surya Sivakumar, he made his acting debut in 2007 with the top-grossing film Paruthiveeran, receiving critical acclaim and the Filmfare Award for Best Actor for his performance as the titular character. He went on to appear in commercially successful ventures such as Aayirathil Oruvan, Paiyaa, Naan Mahaan Alla and Siruthaiwhich established him in the Tamil film industry
Karthi was born in Chennai, Tamil Nadu to actor Sivakumar and Lakshmi. He has an elder brother, Surya who is an actor in the Tamil film industry and a younger sister named Brindha Sivakumar. He graduated from St. Bede's Anglo Indian Higher Secondary School in Chennai after which he went on to complete his graduation in Mechanical Engineering from the Crescent Engineering College, Chennai. He got a scholarship for his higher studies in the United States, where he earned a Master's degree in Industrial Engineering from Binghamton University, New York. He worked as a graphic designer there for some time, before realizing his priorities and deciding to pursue a career in filmmaking.