 In addition to his work as a GP, Hobbs was a co-founder of Medic Alert in Australia and of the Clovelly Park Community Health Centre in southern Adelaide, and taught at Flinders University.Hobbs worked for most of his adult life with Community Aid Abroad and its successor Oxfam Australia, serving as South Australian Chair, National Chair, and Chair of CAA Trading.He was instrumental in convincing then Foreign Minister Bill Hayden to withdraw aid to the Ethiopian government during their 'civil war' with Eritrea, and was a frequent guest on the Australian Broadcasting Corporation's radio and television current affairs programmes, notably "PM" on Radio National and "Nationwide" on Channel 2.