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Hannam was appointed by Prime Minister John George Diefenbaker to the National Productivity Council and was also a delegate to the United Nations Food and Agricultural Organization and served as president of the International Federation of Agricultural Producers.
In August 2003, the Overseas Development Institute (ODI), the UK Department for International Development (DFID) and the United Nations Food and Agricultural Organization (FAO) joined together in a collaborative research project to look at bringing together livelihoods thinking with concepts from information and communication for development, in order to improve understanding of the role and importance of information and communication in support of rural livelihoods.
He worked with the United Nations Food and Agricultural Organization in Turkey and India before moving to Rome in 1973.