Professor Alexander Yeung, PhD, is a professor at the Institute for Positive Psychology and Education in Australian Catholic University. He is an educational psychologist, a linguist, and an internationally acclaimed expert in conducting large-scale longitudinal research with mixed-method approaches. He has been a teacher, a teacher educator, a curriculum designer, and an administrator. His research includes achievement motivation, self-concept, language acquisition, measurement and evaluation, cognition and instruction, Indigenous education, and multiculturalism.