Dr. Ying-Chih Chen is an associate professor. Dr. Chen has used longitudinal, ethnographic, mixed-methods and quasi-experimental approaches to investigate (1) how the synergic use of talking and writing can best support students’ knowledge development, social negotiation and epistemic engagement in argument-based disciplinary discourse, (2) how an argumentative environment influences the development of students’ reasoning abilities and (3) how students’ uncertainty can be adapted as pedagogical resources for knowledge development.