Prof. Sibel Erduran from University of Bristol is a renown researcher, author and lecturer in fields such as science education, argumentation in science education and philosophy of chemistry. Her contribution to a seminar at the University of Oslo a few years ago was the starting point of my interest in argumentation in science education. In fact, this was the main impulse for me getting involved in what we now call "the Kitchen stories project" (see below).
Her 1 hr lecture + Q/A session at Penn State University was on the topic of argumentation in education (mainly middle school) and professional development of teachers, titled "Modeling Epistemic Practices in Teachers' Learning: The case of argumentation". This lecture is available on the university's web pages (open access, hopefully online for a long time).
Sibel Erduran: "Modeling Epistemic Practices in Teachers' Learning: The case of argumentation"