[5][6] Marmon spent his early football years at Plymouth Argyle and Torquay United, making four appearances for the later in the 1979–80 season.
In 1982, he joined SC Rinteln and, the following year, TuS Hessisch-Oldendorf, two amateur clubs from the German state of Lower Saxony.
Bundesliga but fell out with manager Slobodan Cendic and moved to his country of birth, joining Colchester United in January 1990 to play in the Fourth Division.
[6] Dropping out of fully professional football, he remained in south-western Germany and spent time with third division sides FSV Salmrohr and, later, SV Elversberg, first becoming player-manager and later manager with the club.
[11] Post full-time football, Marmon, worked for a sports article manufacturer, living alternately in London and Merzig, Germany.