Greg. Costikyan did not have the same profession as a member of the band System of a Down.
John Hovig Dolmayan (Armenian:   , born July 15, 1973) is a Lebanese-born ArmenianAmerican songwriter and drummer. 
Greg Costikyan (born July 22, 1959, in New York City), sometimes known under the pseudonym "Designer X", is an American game designer and science fiction writer. 
 The band currently consists of Serj Tankian (lead vocals, keyboards), Daron Malakian (vocals, guitar), Shavo Odadjian (bass, backing vocals) and John Dolmayan (drums). 
