He is not one of those who joined John Galt's strike, his resignation being a personal choice of his own.
hiː ɪz nˌɑːt wˈʌn ʌv ðoʊz hˌuː dʒˈɔɪnd dʒˈɑːn ɡˈɔlts stɹˈaɪk, hɪz ɹˌɛzɪɡnˈeɪʃən bˌiːɪŋ ɐ pˈɜːsənəl tʃˈɔɪs ʌv hɪz ˈoʊn.