Nathanael Reinertsen is a research fellow in the Assessment and Psychometric Research division of the Australian Council for Educational Research (ACER). Since joining ACER in 2014, he has worked developing large-scale tests of reading and writing for domestic and international clients, supervised marking, and delivered presentations to educators in Western Australia and the Northern Territory. Prior to joining ACER, he worked as a high school English teacher in Western Australia in both government and independent schools. He held positions as head of English and campus co-ordinator at a multi-campus independent school which highlighted for him how important sound assessment methods and moderation practices are in schools. This led to him developing an interest in educational assessment and pursuing further study. Nathanael completed a Master of Education in Assessment, Measurement and Evaluation (Coursework) at the University of Western Australia in 2012 and completed his PhD at Edith Cowan University in 2020.