dˈʊɹɹɪŋ hɪz ɡɹˈædʒuːət stˈʌdiz, hiː dɪtˈɜːmɪnd ðə kɹˈɪstəl stɹˈʌktʃɚɹ ʌv sˈɛvɹəl kɹˈɪɾɪkəl ɐpəptˈɑːɾɪk pɹˈoʊtiːnz, ɪŋklˈuːdɪŋ ɐpˈæf wˈʌn, dˈaɪəp wˈʌn, ænd ðə bˌiːˌaɪˈɑːɹ θɹˈiː dəmˈeɪn ʌv zˈaɪəp.
During his graduate studies, he determined the crystal structure of several critical apoptotic proteins, including apaf-1, DIAP1, and the BIR3 domain of XIAP.