Cowan was a left wing activist and founder member of the Scottish Labour Party.

[1] He was also majorly involved in the development of Body Positive, the self-help agency for those living with HIV.

Eric Kay, in Gay Scotland's article on his passing, wrote that Cowan:"was particularly skilful in fighting against the prejudice and dispelling the myths surrounding the virus.

His eloquent delivery on the subject was always compelling, whether he was teaching young children or convincing politicians and Health Board funders.

His determination ultimately brought about key policy changes which in turn have radically affected HIV Services in the West of Scotland.