hiː hæd sˈɛvɹəl stˈɪnts æz ɐ vˈɪzɪɾɪŋ ɐsˈɪstənt pɹəfˈɛsɚ ɔːɹ vˈɪzɪɾɪŋ pɹəfˈɛsɚɹ æt jˌuːnɪvˈɜːsᵻɾiz ɪnðə juːnˈaɪɾᵻd stˈeɪts, sˈʌtʃ ɐz ðə jˌuːnɪvˈɜːsᵻɾi ʌv kˌælɪfˈoːɹniə, bˈɜːkli, ðə jˌuːnɪvˈɜːsᵻɾi ʌv kˌælɪfˈoːɹniə, sˈæntə bˈɑːɹbɚɹə, stˈænfɚd jˌuːnɪvˈɜːsᵻɾi, ænd ðə jˌʊɹɹəpˈiən ɡɹˈædʒuːət skˈuːl.
He had several stints as a visiting assistant professor or visiting professor at universities in the United States, such as the University of California, Berkeley, the University of California, Santa Barbara, Stanford University, and the European Graduate School.