English musician and composer, born 11 November 1956 in Sheffield, England. He was a founding member of the electronic band [[artist:The Human League]], writing and playing on their first two albums and several singles, until leaving in 1980 to form the [[artist:British Electric Foundation]] and later [[artist:Heaven 17]] together with [[artist:Martyn Ware]] (after the beginning, alongside Adi Newton from Clock DVA, as [[artist:The Future (3)]]).

In 2006 he disappeared from the band's activities and in 2008 Ware finally stated that Marsh was no longer an active member of [[artist:Heaven 17]].