We dedicate this handbook to the memory of Geoffrey Leech, one of the true pioneers of English corpus linguistics. Geoff contributed seminal research to all aspects of corpus linguistics, from corpus construction to corpus tagging and annotation, to the evaluation of corpus representativeness. But from our point of view, Geoff’s most important contributions involved the application of corpus-based analysis to investigate linguistic research questions about language variation and use. Geoff contributed to nearly all major subdisciplines of English linguistics with such analyses, including pragmatics, stylistics, descriptive grammar, dialect differences, and historical change. For us personally, Geoff was a model, mentor, co-author, and friend. He will be sorely missed.