ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti sˈɪks, hiː wʌz ɐpˈɔɪntᵻd sˈiːnjɚ sˈaɪəntɪst ænd dᵻɹˈɛktɚɹ ʌvðə hˈɑːspɪɾəl fɔːɹ sˈɪk tʃˈɪldɹənz ɹᵻsˈɜːtʃ ˈɪnstɪtˌuːt.
In 1996, he was appointed senior scientist and director of the Hospital for Sick Children's Research Institute.