hiː ɪz ɐ spˈɛʃəlˌɪst ɔnðə ɹᵻlˈeɪʃənəl mˈɑːdəl ʌv dˈeɪɾəbˌeɪs mˈænɪdʒmənt, hˌævɪŋ mˌeɪd kˌɑːntɹɪbjˈuːʃənz ɪnðə fˈiːld ʌv tˈɛmpɚɹəl dˈeɪɾəbˌeɪsᵻz, wˌɛɹ hiː hɐz kˈoʊˈɔːθɚd ɐ bˈʊk wɪð hjˈuː dˈɑːɹwən ænd kɹˈɪstəfɚ dʒˈeɪ dˈeɪt.
He is a specialist on the Relational Model of Database Management, having made contributions in the field of temporal databases, where he has co-authored a book with Hugh Darwen and Christopher J Date.