Dejan is a consultant haematologist who is a local graduate of the University of Western Australia who has done his haematology training in Perth and a fellowship at Columbia University, New York. He works at Western Diagnostic Pathology, Hollywood Private Hospital, Joondalup Health Campus and Sir Charles Gairdner Hospital. His research interests are in T-cell lymphoma where he is the co-chair of the Australian T-cell lymphoma network, multiple myeloma and post transplant lymphoproliferative disorders.