[1] As a former drummer of the heavy metal band Machine Head, he performed on their first album, 1994's Burn My Eyes.
[4][2][3] He played in many bands and projects before and after that period of time, including Testament, Konkhra, Attitude Adjustment, Exodus, Death Angel, and Verbal Abuse.
[2][5] Kontos is recognized by his peers for his performance on songs—notably in "Davidian"—which are "considered by many as classic pieces of metal drumming".
[2] Kontos performed with Machine Head for the first time in 24 years with a tour celebrating the 25th anniversary of the release of Burn My Eyes in 2019,[4][6] though, he never officially rejoined the band.
[8] Kontos currently uses Ddrum drums, Soultone cymbals, Vic Firth drumsticks, and Czarcie Kopyto pedals.