"Linguistic complexity in interlanguage varieties, L2 varieties, and contact languages"
Freiburg Institute for Advanced Studies, May 21--22, 2009
co-organized with Bernd Kortmann
workshop website

"Language, space, and geography"
Freiburg Institute for Advanced Studies, November 26--28, 2009
co-organized with Peter Auer
workshop website

"Probabilistic syntax: phonetics, diachrony, and synchrony"
Freiburg Institute for Advanced Studies, March 21--24, 2010
co-organized with Joan Bresnan
workshop website

"Cross-linguistic and language-internal variation in text and speech: focus on the joint analysis of multiple characteristics"
Freiburg Institute for Advanced Studies, February 9--11, 2011
co-organized with Bernhard Wälchli
workshop website