Materoa is of Nga Puhi, Ngati Whatua and Ngati Porou descent, and has been involved in mental health and Māori health for more than 25 years in various roles. Materoa is currently Director - Māori Health for a large primary healthcare organisation based in Palmerston North and also Leads the Whānau Ora Alliance Te Tihi o Ruahine.
She is a Trustee of the Mental Health Foundation and served as Chair from 2004 to 2010. Materoa has also held various other Governance roles on boards including Te Kura Kaupapa Māori o Manawatu, Hato Paora College and Te Rau Ora (formerly known as Te Rau Matatini). She has also been involved over time with Indigenous Development and has benefited from visiting with and maintaining a broad range of relationships internationally.
Materoa is passionate and committed to improving the quality of services to tangata whaiora and whānau.