In 1962-63, he studied composition with Adam Soltys at the L'viv Mykola Lysenko Conservatoire. From 1965 to 1970 Yehven studied composition with Boris Lyatoshynsky and Myroslav Skoryk at the Kyiv Conservatory. He has worked as a music editor, since 1988 - as a professor of composition in the Kyiv Conservatory, now the National Music Academy of Ukraine, since 1998.