This open access book provides a review of research studies, theoretical and conceptual frameworks, methodology, and results in discipline-based Science, Technology, Engineering and Mathematics (STEM) education research (DBER). It includes frameworks that examine the engagement of diverse learners, and that desettle and disrupt existing norms of STEM and STEM education. It showcases a collection of works from diverse scholars engaged in DBER scholarship and practice, and aims to transform postsecondary STEM teaching and learning. Through these, this book guides in the building of practices that foster the expansion and diversification of postsecondary STEM education, and STEM career advancement.