Alexander Kosemian was born in 1946 in Yerevan.
Mr.Kosemian graduated from the Yerevan Conservatory in 1971 as violinist, where he studied under Professor Bogdanian.
He has worked as violinist-concertmaster at the Armenian Symphony and Chamber Orchestras. Starting 1990, Mr.Kosemian has been a memeber of Komitas String Quartet touring throughout Europe, the United States and a number of Asian countries. As violinist and violist has premiered many works by the Armenian composers. Mr. Kosemian has made numerous archive recondings for National Radio Company.
Alexander Kosemian has had recital appearances. He is involved in teaching activity at Yerevan Conservatory leading violin and viola classes.