Geoffrey Harrison worked in Melbourne as a publicist in the performing arts field including for comedy festivals and theatrical and musical performances and tours from 1983 to 1990. From 1991 he concentrated on publicity for Human Immunodeficiency Virus / Acquired Immune Deficiency Syndrome (HIV/AIDS) awareness programs and campaigns through print, radio, and events. He was involved in a number of advocacy and advisory groups including the Victorian AIDS Council, the AIDS Coalition to Unleash Power (ACT UP), the Australian Federation of AIDS Organisations, the National People Living with AIDS Coalition and its successor the National Association of People Living with HIV/AIDS (as Convenor of People Living with AIDS Victoria).