- Semantics of grammatical systems
- Linguistic typology
- Language description
- Chadic and Afroasiatic languages
- Genetic and linguistic relations in Northern Cameroon (with John Hewitt, of the IBS). Sponsored by the Jane and Charles Butcher Foundation.
- Chadic Syntactic Typology. Initiated under the Humboldt Research Award.
- Chadic Migrations, University of Colorado Seed Grant
- Not Sponsored:
- Typology of reference systems