Mataroria is a public health doctor, lead clinical advisor for Māori health at Counties Manukau District Health Board, and a Senior Lecturer in Medical Education at the University of Auckland. His research field is in performance measurement of healthcare systems, and his PhD is focused in medical education. He completed his Master of Public Health at Harvard University as a Fulbright Scholar in 2017.
Mataroria is an advisory group member for Aktive Sport Auckland, serves on the steering committee for the Ministry of Health Primary Care Models of Care Research Partnership, and is a member of the Health Quality and Safety Commission Patient Experience of Care Governance Group. He has served on the board of Te Ohu Rata o Aotearoa (Māori Medical Practitioners Association) and was a member of the Māori Health Gains Advisory Committees for Auckland, Waitemata, and Counties Manukau District Health Boards.