My primary research area is Documentary Linguistics which involves collecting, archiving, and analyzing endangered language data through original field investigation. My publications include The Grammar of Meithei (Mouton 1997) and the Handbook of Descriptive Linguistic Fieldwork (co-authored with Willem de Reuse, Springer 2010). I also work on the documentation of Lamkang, a Tibeto-Burman language spoken in Manipur State, India. Other work in Manipur includes the study and digitization of old Manipuri manuscripts from the 16th-18th centuries. I also conduct research on the structure and use of English around the world, with special emphasis on the teaching and use of English in the former British colonies. I am an Associate Editor of the journal Himalayan Linguistics and am on the Editorial Board of the journal Linguistics of the Tibeto-Burman Area. I am currently the Program Director for the Documenting Endangered Languages program at the National Science Foundation.