2011 “The grammar of use and the use of grammar.” Conference on System, Usage, and Society. Freiburg Institute of Advanced Study, Freiburg, Germany. November.
2006 “Endangered language varieties: Vernacular speech and linguistic standardization in Brazilian Portuguese.” Georgetown University Roundtable. March. (with Ana Zilles)
2005 “Diglossia, code-switching, style-shifting: A field theory of variety alternation.” NWAV 34, New York University, October. (lead author, with Laureen Lim).
2003 “The limits of linguistic community: Speech styles and variable constraint effects.” NWAV-32. University of Pennsylvania, October. (second author, with Laureen Lim).