Ontronik "Andy" Khachaturian (Armenian: Անդրանիկ (Անտի) Խաչատուրեան/Անդրանիկ (Անդի) Խաչատրյան born May 4, 1975) is an Armenian–American, musician, producer and DJ. He is known for being the original co-founder/drummer (1993–1997) of the Grammy Award-winning rock band System of a Down and founder/lead singer (1999–2002) of the alt-progressive rock band The Apex Theory.
Andy Khachaturian, was born to Armenian parents in Los Angeles, United States. Following being Armenian descent, studied at an Armenian school called "Rose and Alex Pilibos Armenian School", which was also attended by Serj Tankian, Daron Malakian and Shavo Odadjian. He met Daron and Shavo primary in high school. Khachaturian then met Serj and when they decide in 1994 to form the band System of a Down. Together they recorded a demo titled "Untitled 1995 Demo" and "Demo Tape 1". In 1996 they recorded "Demo Tape 2" and in 1997 recorded "Demo Tape 3" and "Demo Tape 4". In 1997, after spending four years with System of a Down, Andy had to leave the band due to surgery on his left hand, due to an accident practicing Jeet Kune Do, and was replaced by John Dolmayan, current drummer of System of a Down.
In 1998, Ontronik with Art Karamian, David Hakopyan and Sammy J. Watson decided to form the band The Apex Theory, bringing to market 2 music albums and 1 EP. Then they decided to rename the band Mt. Helium. In 2002 Ontronik left the band because of musical differences. After leaving The Apex Theory, Ontronik formed a rock band in 2004 with a group of friends, called VoKee. Currently Ontronik is working in Los Angeles, California in his "OnTronik ™" project as his solo project.