For the record: the "distinguished-looking" philosopher called Paul Grice and his quote -- to be found at this link.

Speranza

PHILOSOPHICAL Grounds and Rationality: Intentions, Categories, Ends - Pagina 69 - Risultati da Google Libri

books.google.com/books?isbn=0198244649 - Traduci questa pagina

Richard E. Grandy, Richard Warner - 1988 - Belief and doubt

... mail-box called "red"?' than would be 'Because he is Paul Grice' as an answer to the question 'Why is that distinguished-looking person called "Paul Grice"?