Mohajer has extensive cross-cultural experience as a migrant individual speaking a number of languages. Mohajer holds a master of psychoanalysis and PhD in developmental psychopathology, with an emphasis on quantitative methodologies. He has worked as a senior clinician providing assessment and psychotheraputic interventions with families and children involved with Victorian child protection authorities. Mohajer has also worked as a research and evaluation team leader within a child and family service organisation, and currently is a research fellow within the University of Melbourne Department of General Practice, Safer Families Centre of Research Excellence.