https://orcid.org/0000-0002-6644-0098Dr. Kulasegaram (Mahan)'s research advances our understanding of how assessment can be used to enhance learning. At the learner level, using theories from psychology and psychometrics, his research explores how assessment practices can enhance the transfer of learning—an important step for developing clinical expertise in medicine. At the level of the education program and system, he studies how assessment "big data" can be used to improve program practices and outcomes. His research addresses the entire continuum of training from undergraduate to continuing education and reexamines the entire context of assessment—the objectives, process, tools, learners and assessors.