This monograph proposes a new interpretation of the intrasegmental structure of consonants and provides the first systematic intra- and cross-linguistic study of consonant prevocalization. The proposed model represents consonants as inherently bigestural and makes strong predictions that are automatically relevant to phonological theory at both the diachronic and synchronic levels, and also to the phonetics of articulatory evolution. It also clearly demonstrates that a wide generalization of the notion of consonant prevocalization provides a uniform account for many well-known processes generally considered independent – from asynchronous palatalization in Polish to intrusive [r] in nonrhotic English, to vowel epentheses in Avestan, and to pre-/s/ vowel prothesis in Welsh. Consonant prevocalization has not played a significant role in the development of modern phonological theory to date, and this work is the first to highlight its broad theoretical significance. It develops important theoretical insights, with a wealth of supporting data and a rich bibliography. No doubt, this book will be of great interest to phonologists, phoneticians, typologists, and historical linguists.