Robert W. SchraufRobert Schrauf is Professor and Head of the Department of Applied Linguistics at Pennsylvania State University. He co-edited Language Development over the Lifespan (2009; with Kees de Bot, University of Groningen) and Dialogue and Dementia: Cognitiveand Communicative Resources for Engagement (2014; with Nicole Müller, University of Linköping). Read More Read Less