ɪnðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi z hiː stˈɑːɹɾᵻd wˈɜːkɪŋ ˌɔn ɐlˈeɪn kˈɑːnz nˈɑːŋkˈɑːmjuːɾətˌɪv dʒiˈɑːmətɹi, ɪspˈɛʃəli stˈʌdiɪŋ ðɪ ˌæplɪkˈeɪʃənz ɪn ˌɛlɪmˈɛntɚɹi pˈɑːɹɾɪkəl fˈɪzɪks.
In the 1980s he started working on Alain Connes' non-commutative geometry, especially studying the applications in elementary particle physics.