Was born in 1953 in Tehran. He studied Piano under Emanuel Melik Aslanian. In 1971, he studied harmony and counterpoint at Guildhall Music School and London College of Music. Khajenouri got his Composition Diploma and could reach the degree of F.L.C.M. He learned the electronic music under Micheal Grubert at Morley College. After returning to Iran, during two decades, he had been teaching composition and music for film at Iran Broadcasting University, Dramatic Arts Faculty of Tehran and Tehran University of Art. Over the years, he has instructed and nurtured so many students and he has held classes and workshops in which even the very first students of electronic music in Iran participated. His works have been performed in Iran and Europe by so many Ensembles such as Integrales, Tufa, Trio Classiuqe de Paris, Fortuna Quartet, Mixtura and Yarava Modern Orchestra.