 McCallum is the first totally blind person to be appointed by any university in Australasia to a full professorship in any field or as Dean of Law.McCallum is the inaugural President of the Australian Labour Law Association, and the Asian regional Vice-President of the International Society for Labour and Social Security Law.He has also done extensive work for the blind as the Chair of Radio for the Print Handicapped of New South Wales Co-operative Ltd, a company that operates radio 2RPH, which reads newspapers and magazines for blind and for other print handicapped listeners over the air.