Sallek earned his doctorate degree in Sociology with specialisation in civil-military relations from the department of Sociology and Social Anthropology in the University of Stellenbosch, South Africa. Prior to this, he obtained a distinction in MSc. Criminology at the University of Northampton, England, and a Bachelor of Science degree in Sociology from the University of Jos, Nigeria. His research interest cuts across the theories and general field of civil-military relations, criminology and security studies, policing, peace and conflict management/resolution, governance, armed groups, and human rights. Sallek has been a recipient of fellowships from the Next Generation Africa Social Sciences Research Council (SSRC) New York and Lisa Maskel Doctoral Research Fellowships (Germany), and is currently a Postdoctoral Research Fellow with Stellenbosch University.