dʒˈæn dʒˈeɪkəb θiːədˈoːɹ "θˈiːoʊ" dˈɔɪɚ dᵻsˈɛmbɚ twˈɛnti nˈaɪn, nˈaɪntiːnhˈʌndɹɪd fˈɪfti fˈaɪv noʊvˈɛmbɚ tˈɛn, tˈuː θˈaʊzənd tˈɛn wʌzɐ fˈiːld hˈɑːki plˈeɪɚ fɹʌmðə nˈɛðɜːləndz, hˌuː wʌzɐ mˈɛmbɚɹ ʌvðə dˈʌtʃ nˈæʃənəl tˈiːm ðæt fˈɪnɪʃt sˈɪksθ ɪnðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi fˈoːɹ sˈʌmɚɹ əlˈɪmpɪks ɪn lˌɑːs ˈændʒəlɪs.
Jan Jacob Theodoor "Theo" Doyer (December 29, 1955 – November 10, 2010) was a field hockey player from the Netherlands, who was a member of the Dutch National Team that finished sixth in the 1984 Summer Olympics in Los Angeles.