Ad Pepper Media N.V., he remained on the board as its R&D director until 2009. Crystal was influential in a campaign to save Holyhead's convent from demolition, leading to the creation of the Ucheldre Centre. Involvement in Shakespeare productions As an expert on the evolution of the English language, he was involved in the production of Shakespeare at Shakespeare's Globe in 2004 and 2005 in the "Original Pronunciation" of the period in which he was writing, coaching the actors on the appropriate pronunciation for the period, and has since been the consultant for several other Shakespeare plays performed in OP, including A Midsummer Night's Dream, Hamlet, Macbeth, Pericles, The Merchant of Venice, and Henry V. Bibliography Books Crystal, David and Quirk, Randolph (1964). Systems of Prosodic and Paralinguistic Features in English. The Hague: Mouton. Crystal, David (1965). Linguistics, Language and Religion. London: Burns & Oates. Crystal, David (1968). What is Linguistics?. London: Edward Arnold. Crystal, David and Davy, Derek (1969). Investigating English Style. London: Longman. Crystal, David and Boulton, W.F. (eds.) (1969). The English Language: Essays by Linguists and Men of Letters, Vol. 2 1858-1964. Cambridge: Cambridge University Press. Crystal, David (1969). Prosodic Systems and Intonation in English. Cambridge: Cambridge University Press. Crystal, David (1971). Linguistics. Harmondsworth: Penguin. Crystal, David and Davy, Derek (1975). Advanced Conversational English. London: Longman. Crystal, David (1975). The English Tone of Voice: Essays in Intonation, Prosody and Paralanguage. London: Edward Arnold. Crystal, David, Fletcher, Paul and Garman, Michael (1976). The Grammatical Analysis of Language Disability: A Procedure for Assessment and Remediation. London: Edward Arnold. Crystal, David (1976). Child Language, Learning and Linguistics. London: Edward Arnold. Crystal, David (1979). Working with LARSP. London: Edward Arnold. Crystal, David (ed.) (1980). Eric Partridge in His Own Words. London: Deutsch. Crystal, David (1980). Introduction to Language Pathology. London: Edward Arnold. Crystal, David (1981). Clinical Linguistics. Vienna & New York: Springer. Crystal, David (1981). Directions in Applied Linguistics. Academic Press. Crystal, David (ed.) (1982). Linguistic Controversies. London: Edward Arnold. Crystal, David (1982). Profiling Linguistic Disability. London: Edward Arnold. Crystal, David (1984). Who Cares About English Usage?. Harmondsworth: Penguin. Crystal, David (1984). Linguistic Encounters with Language Handicap. Oxford: Blackwell. Crystal, David (1986). Listen to Your Child: A Parent's Guide to Children's Language. Harmondsworth: Penguin. Crystal, David (1988). The English Language. Harmondsworth: Penguin. Crystal, David (1991). Making Sense of English Usage. Edinburgh: Chambers Crystal, David (1991). Language A to Z with David