As a schoolboy David signed for Liverpool F.C. before breaking into the all-conquering first team of the 1970s/80s.
During that time he won numerous domestic and European titles, while developing a goal-scoring reputation where he is remembered as ‘Supersub’.
Later he went on to play in Switzerland and Belgium before joining the PFA upon retirement from football, while also working in journalism and television as a pundit/commentator.
Since then he has been a director of the online portal Sportsnetglobal and more recently a medical and research company, Medisport Scientific Innovations.