Ian Craig Marsh ( born 11 November 1956 ) is a British musician , a founding member of the electronic band The Human League , until leaving in 1980 to form B.E.F. ( British Electric Foundation ) and later Heaven 17 . Ian Craig Marsh ( born 11 November 1956 , Sheffield , England ) is a former English musician . He was a founding member of the electronic band The Human League , writing and playing on their first two albums and several singles , until leaving in 1980 to form B.E.F. ( British Electric Foundation ) and later Heaven 17 .