Karthik Sivakumar (Tamil: கார்த்திக் சிவகுமார் ; born 25 May 1977), popularly known by his stage name Karthi, is a Tamil film actor. Son of 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 Aayirathil Oruvan, Paiyaa and Naan Mahaan Alla. establishing himself in the Tamil film industry.
Born in Chennai, Tamil Nadu, Karthi is the son of film actor Sivakumar and Lakshmi , and younger brother to actor Surya, and also has a younger sister Brindha. Karthi graduated from St. Bede's Anglo Indian Higher Secondary School in Chennai after which he went on to complete his undergrade from the Crescent Engineering College, Chennai. He graduated in Mechanical Engineering and got a scholarship to the United States, where he earned a master's degree in Industrial Engineering from Binghamton University in New York. He later got a job and was working as a graphic designer there for some time, before realizing his priorities and deciding to pursue a career