Hussein Abdinassir is an advocate of the High Court of Kenya. He is a holder of Bachelor of Laws (LLB) degree from the University of Nairobi and a member of the Law Society of Kenya (LSK), Muslim Lawyers Forum, the Kenya Red Cross Society (life member) and the East African Law Society.

He is a founding member of RNR Advocates. Hussein has previously practiced as an associate with Abdurrahman, Saad and Associates. He also worked as the Legal officer for Arid lands Development Focus (ALDEF), as a project officer for the Consortium for Empowerment and Development of Marginalized Communities (CEDMAC) and as a Human Rights Officer with Muslim for Human Rights Forum (MHRF).
Hussein has had a long standing, passionate commitment in promoting Human Rights, Devolution, Good Governance and Humanitarian Courses.

Hussein is a dormant Partner with RNR as he is currently serving as the Legal Advisor and the Head of Intergovernmental and Donor Liaison to the County Government of Wajir.