ɪn hɪz fˈɜːst jˈɪɹ ɪnðɪ ˌɛnˌɛfˈɛl, sˈiːmən wˈɜːkt æz ɐ lˈaɪn dʒˈʌdʒ bᵻfˌoːɹ mˈuːvɪŋ tə hˈɛd lˈaɪnzmən ænd ᵻvˈɛntʃuːəli ɹˌɛfɚɹˈiː, ɐ pəzˈɪʃən hiː hˈɛld fɹʌm nˈaɪntiːnhˈʌndɹɪd sˈɛvənti nˈaɪn ʌntˈɪl ðə kəŋklˈuːʒən ʌvðə nˈaɪntiːnhˈʌndɹɪd nˈaɪnti ˌɛnˌɛfˈɛl sˈiːzən.
In his first year in the NFL, Seeman worked as a line judge before moving to head linesman and eventually referee, a position he held from 1979 until the conclusion of the 1990 NFL season.