hiː spˈɛʃəlˌaɪzᵻz ɪn fˈɜːst ænd sˈɛkənd lˈæŋɡwɪdʒ ɐkwɪsˈɪʃən, sˌaɪkoʊlɪŋɡwˈɪstɪks, ænd ðə nˌʊɹɹəlˈɑːdʒɪkəl bˈeɪsᵻz ʌv lˈæŋɡwɪdʒ, ænd hiː hɐz ɹˈɪʔn̩ ænd ˈɛdɪɾᵻd sˈɛvɹəl bˈʊks ænd ˌoʊvɚ wˈʌnhˈʌndɹɪd pˈɪɹᵻvjˈuːd ˈɑːɹɾɪkəlz ænd bˈʊk tʃˈæptɚz ˌɔn ðiːz sˈʌbdʒɛkts.
He specializes in first and second language acquisition, psycholinguistics, and the neurological bases of language, and he has written and edited several books and over 100 peer-reviewed articles and book chapters on these subjects.