dʒˈɑːnsən bɪkˌeɪm ɐn ɪnstɹˈʌktɚɹ ʌv kˈɛmɪstɹi æt ðə ʃˈɛfiːld saɪəntˈɪfɪk skˈuːl ɪn nˈaɪntiːnhˈʌndɹɪd tˈuː ænd ðˈɛn ɐn ɐsˈɪstənt pɹəfˈɛsɚɹ ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪn.
Johnson became an instructor of chemistry at the Sheffield Scientific School in 1902 and then an assistant professor in 1909.