chief executive officer

UK: /t‍ʃˈiːf ɛɡzˈɛkjuːtˌɪv ˈɒfɪsɐ/   US: /ˈtʃif ɪɡˈzɛkjətɪv ˈɔfəsɝ/, /ˈɔfɪsɝ/