Professional scholars were impressed by his work and in 1930 he received a grant to study the Nahuatl language in Mexico; on his return home he presented several influential papers on the language at linguistics conferences.
Tema töö avaldas muljet professionaalsetele teadlastele ja 1930. aastal sai ta stipendiumi, et uurida nahua keelt Mehhikos; tagasi USAs esines ta keeleteaduslikel konverentsidel mitme mõjuka ettekandega nahua keelest.