Qualifying as a nurse in 1985 Dean specialised in critical care. He trained as a counsellor gaining an MA in Psychoanalytic Studies. He moved into Sexual Health focussing on Blood Borne Viruses, particularly HIV. Dean was asked to write and lead on a HIV training program for the UN in India. This experience started a long association with capacity building at community level. Subsequently Dean has worked with Mildmay, CDC and Medicine Sans Frontieres in Eastern Europe and across Africa. In 2012 he was Awarded Gasto Nurse of the Year for his work on capacity building in underserved communities. For the last two years Dean has worked in Public Health focussing on Immunisation and Vaccinations particularly Vaccine Hesitancy.