ˈaɪsɜːn mˌeɪd hɪz jˈuː.ˈɛs. deɪbjˈuː æt ðɪ ˈeɪdʒ ʌv sˈɛvəntˌiːn æt ðə mˈæməθ mˈaʊntɪn wˈɜːld mˈaʊntɪn bˈaɪk tʃˈæmpiənʃˌɪps ɪn ˈɔːɡəst nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi ˈeɪt wˌɛɹ hiː ˈiːzili klˈɪntʃt ðə tɹˈaɪəlz kˌɑːmpətˈɪʃən.
Isern made his U.S. debut at the age of 17 at the Mammoth Mountain World Mountain Bike Championships in August 1988 where he easily clinched the Trials competition.