hiː tʃˈɛɹd ðə dᵻpˈɑːɹtmənt ʌv mˌæθɪmˈæɾɪks æt ðə jˌuːnɪvˈɜːsᵻɾi ʌv mˈɪʃɪɡən nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi fˈoːɹ dˈæʃ nˈaɪntiːnhˈʌndɹɪd nˈaɪnti fˈoːɹ, ænd sˈɜːvd æz dᵻɹˈɛktɚɹ ʌvðə dᵻvˈɪʒən ʌv mˌæθɪmˈæɾɪkəl sˈaɪənsᵻz æt ðə nˈæʃənəl sˈaɪəns faʊndˈeɪʃən ˌɛnˌɛsˈɛf.
He chaired the Department of Mathematics at the University of Michigan (1984-1994), and served as director of the Division of Mathematical Sciences at the National Science Foundation (NSF).