ɐlˈɔŋsaɪd ɹˈɔɪ kˈɔɪl, dʒˈɛfɹi ɪz lˈɪnfiːldz mˈoʊst səksˈɛsfəl mˈænɪdʒɚɹ ɪn hˈɪstɚɹi, hˌævɪŋ wˈʌn θˈɜːɾi wˈʌn tɹˈoʊfiz dˈʊɹɹɪŋ hɪz sˈɛvəntˌiːnjˈɪɹ tˈɛnjɚ.
Alongside Roy Coyle, Jeffrey is Linfield's most successful manager in history, having won 31 trophies during his 17-year tenure.